At PNSN we use the following: Md (Duration Magnitude) - based on the duration of shaking. On this Wikipedia the language links are at the top of the page across from the article title. Or again Wy'east, the chief of the Multnomah tribe, competed with the chief of the Klickitat tribe. How many craters does Taal volcano have? swept down the Hood River valley. Hawaii's Mauna Loa volcano last erupted between March 25 and April 15, 1984, following nearly two years of increased seismic activity. Much of the broad fan of pyroclastic-flow and lahar deposits that underlies Timberline Lodge and Government Camp was constructed during this eruptive period. Mount Hood has erupted episodically for about 500,000 years and hosted two major eruptive periods during the past 1,500 years. While hot springs and steam vents are still active on Mount Hood, the last eruption from the volcano occurred in 1866. Hood's eruptive activity. It is in the U.S. state of Oregon, about 50 miles (80 kilometers) . Volcano Hazards Program website. [8], During the last major glacial event between 29,000 and 10,000 years ago, glaciers reached down to the 2,600-to-2,300ft (790-to-700m) level, a distance of 9.3mi (15.0km) from the summit. for those with respiratory problems, the elderly, and infants. Our publication has won numerous awards over the last 25 years including Best Free Newspaper of the Year (Premios AEEPP), Company of the Year (Costa del Sol Business Awards) and Collaboration with Foreigners honours (Mijas Town Hall). Spectrograms - Landslides, Rock-falls and Avalanches, The Tsunami At Anaqtla or "Pachena Bay", Host a Station for Earthquake Early Warning, https://earthquake.usgs.gov/learn/glossary/?term=magnitude, http://neic.usgs.gov/neis/phase_data/mag_formulas.html, Volcanic history and details of Mount Hood, Mount Hood earthquake activity: volcanic or tectonic origin. The volcano has grown in fits triggered by eruptive activity. Here is a map of Mount Hood showing the epicenters (color coded by depth) for the Mount Hood area (including the likely non-volcanic sources just to the south of the mountain) since 2010. The largest event in a swarm usually does not occur at the beginning (such as a main shock-after shock sequence). The route goes east around Crater Rock and crosses the Coalman Glacier on the Hogsback, a ridge spanning from Crater Rock to the approach to the summit. According to the USGS, Mount Hood is a mount whose eruptions are very episodic and have periods with frequent eruptions over decades to centuries, separated by dormant periods lasting centuries to thousands of years. In the mid-1800's, local residents reported minor explosive activity, but since that time the volcano has been quiet. The Lewis and Clark Expedition explored the mouth of the Sandy River in 1805 and 1806 and described a river much different from today's Sandy. 7. Mount Hood is an active volcano located 50 miles south east of Portland, Oregon, and one of the highest mountains in the States. Those include the Coopers Spur, Cairn Basin, and McNeil Point shelters as well as the Tilly Jane A-frame cabin. It is the highest point in Oregon and the fourth highest in the Cascade Range. At roughly 100,000 years ago, a largedebris avalancheremoved the summit and north flank of Mount Hood and generated a largelaharthat flowed down the Hood River valley to the Columbia. Curious when the last time Mt. [22][23], Two French explorers from the Hudson's Bay Company may have traveled into the Dog River area east of Mount Hood in 1818. Early major eruptions remain a bit of a mystery, but evidence has been found of four major eruptions in the last 15,000 years, including three in the last 1,800 years. Here is a seismicity plot that shows the number of located earthquakes per day (black spikes) and the cumulative number of earthquakes over time (red). Flight Center. Oregon has just about every type of volcano, volcanic eruption style . Sometime by 1866, Reverend G. H. Atkinson determined it to be 17,600ft (5,400m). The largest earthquakes were felt at Timberline, Brightwood, Parkdale, and Mount Hood Meadows. though based on its history, an explosive eruption is unlikely. It is located approximately 75 km ESE of Portland, OR. It is probably the only volcano in Oregon which has erupted significant times. While the Mount Hoodedificewas growing, regional volcanoes of chieflybasaltandbasalticandesitelava flows formed. Lewis and Clark's expedition to the Pacific Northwest. Eruptions of the Polallie eruptive period accompanied and immediately postdated the last majorPleistoceneglaciationin the region. . On 5 June at 20:51 local time, the Cascade Volcano Observatory's (CVO) seismic network detected a volcano-tectonic earthquake with magnitude M 3.9 that occurred about 4 km south of the summit at 4.3 km depth. Land disaster for you, your family, and your community. reveal that lava-dome eruptions, like those typical of Mount Hood, can begin Geology and petrology of the Mount Hood area: a study of High Cascades volcanism. Throughout Mount Hood's history, rapid landslides, called debris Thus, we will all have to confront many St. . Therefore, any attempt to restore the mountain's original indigenous name would require agreement on which language's name to use. Mount Hood, a 500,000-year-old stratovolcano located 50 miles east-southeast of Portland, last erupted in the 1790s, just before Lewis and Clark reached the Pacific Northwest. However, even minor amounts of tephra can damage machinery [8], Since 1950, there have been several earthquake swarms each year at Mount Hood, most notably in July 1980 and June 2002. Sequences of lahars of this age are found downstream along the Sandy, Hood, and White River valleys. valleys, often far beyond the flanks of the volcano. Mount Hood volcano is close to small but rapidly growing communities and recreation areas, . North flank of Mt. volcanoes and the hazards they pose at the USGS Instead, lava flows (see NOTE: A depth of 0.0 (zero) km is at sea level and thus events within the volcano will plot above sea level (negative depths). Official websites use .gov Three Central American countriesEl Salvador, Honduras, and Nicaraguahave coastline along the Gulf of Fonseca, which opens into the Pacific Ocean. For most residents, however, Meaning "long mountain" in Hawaiian, it is the quintessential shield volcano in its shape signified by broad, rounded slopes. The climbs range in difficulty from class 2 to class 5.9+ (for Acrophobia). [16], The name Wy'east has been associated with Mount Hood for more than a century, but no evidence suggests that it is a genuine name for the mountain in any indigenous language. The Cascades Volcano Observatory (CVO) has detected an earthquake swarm in the Mount Hood area, Oregon on June 5, 2021. geologic evidence for large explosive eruptions at Mount Hood, similar to those witnessed in 1980 at Mount St. Helens, which would send large amount of . Eliot Glacier is the largest glacier by volume at 73,000acreft (0.09km3), and has the thickest depth measured by ice radar at 361ft (110m). Scientists believe that if Mount Hood does erupt, it will most likely be the collapse of a lava dome that leads to pyroclastic flows the most deadly meaning thousands of residents would be displaced and millions of dollars of damage would be caused. Using the tools in this panel you can control the earthquakes shown on the map. Scientists don't know the exact date of Mount Rainier's last eruption, but some place it at about 150 years ago, or around the 1860s, but the one that happened then was not noteworthy. We called this the Falls Mountain, or Timm Mountain." Mount Rainier, an active volcano currently at rest between eruptions, is the highest peak in the Cascade Range. The image was taken by the Expedition 20 crew. Three Sisters - Oregon Here is a passage from this website, giving the history: "Mount Hood is one of the major volcanoes of the Cascade Range and is more than 500,000 years old. better anticipate and prepare for future eruptive activity. r/Volcanoes Some videos of Yellowstone's hydrothermal features from this last July. live, work, or go to school in a volcano hazard zone. *To reduce render time, queries have the following limits. For technical reasons several different magnitude scales are in common use. If Lahars are a volcanic hazard, why should anyone care about them when the last eruption of Wy'east/Mt. The lahar spread out over the delta At that time the river was choked with sediment generated by erosion of the deposits from the eruption, which had stopped about a decade before their visit. than 8 miles. Wed, 26 Jun 2002, 06:00. Large earthquake ruptures can take many seconds to finish. The smaller this number, the more reliable the calculated horizontal position of the earthquake. The lahar crossed the Columbia Some sequences cover broad sectors; others are relatively narrow and were probably buttressed byglacierssignificantly larger than those we see today. The latest minor eruptive event . Hood Meadows Ski Resort lies on a sequence of lava flows that are about 55,000 years old. Mount Hood is a potentially active volcano, and the highest peak in Oregon State. By about 30,000 years ago, Mount Hood was probably hundreds of meters lower than and perhaps lacked the jutting summit of today. U.S. Geological Survey Mount Hood's next eruption is much more likely to be smaller than or Mount Hood's last major eruption happened in the 1790's now not lengthy earlier than Lewis and Clark's expedition to the Pacific Northwest. "Old Chute," West Crater Rim, etc.). Prehistoric and historic volcanic eruptions in Oregon. Fact Sheet 060-00 St. Helens, but it does emit steam from its crater and has had five minor eruptions in the past two centuries. gases, or by deformation of the volcano's flanks. one lives, works, and plays in relation to Mount Hood's hazard zones. These proposed stations greatly enhance the ability of USGS-CVO to detect subtle signals beneath the volcano and determine with greater confidence whether or not the volcano poses any imminent threat of eruption. The resulting lahar moved downvalley at 25 to 35 miles per hour. The predicted loss of glacial meltwater under future warming scenarios will have significant effects on regional hydrology and water supplies. U.S Department of Agriculture, Forest Service distal hazard zones along the Sandy River. Mount Rainier is believed to have erupted more than 12 times in the last 2,600 years. Location:Oregon, Clackamas/Hood River Counties Mount Hood's last major eruption occurred in the 1790's not long before forcing it to the north and potentially causing bank erosion along the river's north bank. . A conflict exists between protecting public safety and protecting the environment. eruption ends. Location in geographic coordinates (as Latitude, Longitude in decimal degrees) of the position on Earth's surface directly above where an earthquake rupture initiated. . The name comes from the Greek Aitne, from aith, "I burn." Mount Etna is the highest active volcano in Europe, its topmost elevation being about 10,900 feet (3,320 metres). One represents a truly catastrophic event. The last eruptive period began in AD 1781 and affected the White River as well as Sandy River valleys. tephra will be a nuisance and can be mitigated by such actions as shutting down and covering 2) Click a point on the map, this will be the left side of the cross-section. Native Americans crossed the pass while traveling between the Willamette Valley and Celilo Falls. HAZARDS, Learn more about A lock () or https:// means youve safely connected to the .gov website. . With more than 47 craters and 35 volcanic cones, Taal Volcano remains one of the world's deadliest volcanoes. and starts, with decades to centuries of frequent eruptions separated by quiet The Hogsback terminates at a bergschrund where the Coalman Glacier separates from the summit rock headwall. A powerful explosion sent an ash column of 20,000 ft (ca. What you might be less aware of is that Mount Hood is an active volcano and could, potentially, reawaken and erupt, just like Mount St. Helens did 36 years ago. The swarm continued into June 6 when the activity started to quiet down. Image of the Day Image of the Day The largest event in the roughly 15 sequences during the 1990s varied from M=1.6 to M=3.5. Despite the physical consistency, the estimated elevation of Mount Hood has varied substantially over the years, as seen in the following table: Early explorers on the Columbia River estimated the elevation to be 10,000 to 12,000ft (3,000 to 3,700m). Jefferson is presented on the Cascade Volcano Observatory homepage of the U.S. Geological Survey. Mount Hood is very episodic in its eruptions, having periods where many eruptions have happened almost all of the time. The eroded volcano has had at least four major eruptive periods during the past 15,000 years. Lahars could affect transportation corridors by damaging or destroying bridges and roads. Also, visit the Cascades Volcano Observatory Wise W S, 1969. This type of volcano, is typically associated with more viscous (less runny) lavas like andesite and dacite. The volcano is considered dormant, but still actively monitored. On 10 November 1944, shortly after 18 men had departed for shore leave, the rest of the crew were killed when the ship exploded in Seeadler . event, although large by Mount Hood's standards, was only about one-tenth the The remnants of such fans include (1) the bouldery ridge that rises from above Mount Hood Meadows to Steel Cliff and (2) the broad surface extending from Cooper Spur, below and to the east of the summit, which is deeply incised by Polallie Creek. activity occur more frequently. Located in Skamania County, Washington, the volcano is widely known for its deadly eruption in 1980, which is the deadliest and most economically destructive volcanic eruption in the history of the United States. Secure .gov websites use HTTPS Typically, one to three small earthquake While hot springs and steam vents are still active on Mount Hood, the last eruption from the volcano occurred in 1866. e-mail: cvo@usgs.gov. Mount Defiance (about 500,000 years old) on the south side of the Columbia River gorge and Lost Lake Butte northwest of Mount Hood are two examples of shield volcanoes. This video covers the recent eruptions from this . No part of this website may be reproduced without written permission from the publishers. Read all. Hood is an active volcano. One bridge I crossed . Mount Hood's last major eruption occurred in the 1790's not long before Lewis and Clark's expedition to the Pacific Northwest. The farthest traveledpyroclastic flowreached about 12 km from the lavadome. Mount Baker (Lummi: Qw'm Kwlshn; Nooksack: Kw'eq Smaenit or Kwelshn), also known as Koma Kulshan or simply Kulshan, is a 10,781 ft (3,286 m) active glacier-covered andesitic stratovolcano in the Cascade Volcanic Arc and the North Cascades of Washington in the United States. The USGS designated Mount Hood as a very high threat volcano in its 2005 National Volcanic Early Warning System assessment (http . [13], Mount Hood is within the Mount Hood National Forest, which comprises 1,067,043 acres (1,667sqmi; 4,318km2) of land, including four designated wilderness areas that total 314,078 acres (491sqmi; 1,271km2), and more than 1,200mi (1,900km) of hiking trails. Two months later, a Mr. Belden claimed to have climbed the mountain during a hunting trip and determined it to be 19,400ft (5,900m) upon which "pores oozed blood, eyes bled, and blood rushed from their ears." Threat score: 126 . Mount Hood has erupted three times over the past 2,000 years. A portion of the Pacific Crest Trail is coincident with the Timberline Trail on the west side of Mount Hood. This detailed astronaut photograph shows the summit crater of Mexicos Popocatepetl Volcano on February 7, 2009. However, the local time is also given as a reference for what local residents experience. [51] The Coopers Spur trail leads to 8,510ft (2,590m) in elevation, the highest reachable point one can gain on the mountain without requiring mountaineering gear. When Lewis and Clark visited the mouth of the Sandy River in November 1805 and April 1806, they noted its similarity to the braided Platte River of the High Plains, and named it the Quicksand River. Lt. Broughton observed its peak while at Belle Vue Point of what is now called Sauvie Island during his travels up the Columbia River, writing, "A very high, snowy mountain now appeared rising beautifully conspicuous in the midst of an extensive tract of low or moderately elevated land [location of today's Vancouver, Washington] lying S 67 E., and seemed to announce a termination to the river." [50] The neo-glacial maximum extents formed in the early 18thcentury. A paper published in 2005 (J. Jones and S.D. Keep in mind that the PNSN earthquake recording and processing system changed in very major ways starting in 2012 and thus there can be small biases or changes introduced in event detection, location and size. The last eruption there was some 800 years ago. summit collapsed. Volcanic History . "The last eruption of Mount Rainier was about a thousand years ago. Hood has had three volcanic eruptions over the last 1,800 years. vent location, and type of hazardous events. Lava flows about 40,000 to 50,000 years old that form Langille Crags and Stranahan Ridge and extend almost to Laurence Lake are the younger part of this sequence of scar-fillinglavaflows. A 45-minute "earthquake swarm" reported this week near Oregon's . An eruption similar in size to the are areas subject to rapidly moving debris avalanches, pyroclastic flows, and been quiet. from their source, have built up the flanks of the volcano one sector at a time. Ml (Local Magnitude) - based on the peak amplitudes of high frequency seismograms, and Mw (Moment Magnitude) - based on matching waveforms of the lowest frequency ground motions in broad-band seismograms. The last major eruptive period began in 1781 and lasted to ~1801. I believe . Mount Hood is a potentially active stratovolcano in the Cascade Volcanic Arc. Thus, it is important to know where Mount Hood has played a central role in the geology, history, natural environment, and culture that have helped shape northwest Oregon and the entire Pacific Northwest. debris avalanches and were accompanied by lava extrusion, pyroclastic flows, monitored earthquakes at Mount Hood. Astronaut photograph ISS020-E-28123 was acquired on August 5, 2009, with a Nikon D3 digital camera fitted with an 800 mm lens, and is provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Center. And its FREE! They fill the scar left by the Hood Riverlaharof about 100,000 years ago, which must have extended from todays Eliot Branch westward to beyond Coe Branch. Like other glaciers in the Pacific Northwest, the Hood glaciers have been receding due to global warming, and they have lost an estimated 61 percent of their volume over the past century. Like other active volcanoes, it varies in height, increasing from deposition during eruptions and decreasing from the periodic . Additional information about Mt. travel much farther. 5400 MacArthur Blvd., Vancouver, WA 98661 periods lasting from centuries to more than 10,000 years. Although overridden by extensiveglaciersof the last ice age, many of the lava flows younger than 100,000 years display well-preserved lava-flow features such as levees and flow lobes. The broad flanks of Mount Hood cover an area almost 20 km (12.4 mi) in diameter and are formed of numerous sequences oflavaflows that were emplaced between about 500,000 to 100,000 years ago. jet aircraft by causing engine failure. It temporarily filled the Columbia valley and flowed several kilometers up the White Salmon River valley on the north side of the Columbia. DB, which Commu-nity assets (for example, people, roads, buildings, dams, and electrical systems) around the volcano are at risk from these . Supported by WP Advisor. Towering over the surrounding mountains, Oregons second-tallest peak poses a challenge for climbers and satellites. Even smaller earthquakes can sometimes be detected and located though some also are missed. and generate tens to hundreds of pyroclastic flows and lahars of varying size. The route continues to the Pearly Gates, a gap in the summit rock formation, then right onto the summit plateau and the summit proper. similar in size to the 1,500-year-old event. All of this comes at ZERO cost to our readers. Earlier this year, the USGS reported a 45-minute earthquake swarm near the volcano typically a sign of something to come, however, this is not always the case. But small ones not associated with eruptive might also be accompanied by changes in composition or temperature of fumarole More impressive, however, it rises an astonishing 30,000 . During Lunchtime on November 5th, 2022, A somewhat benign Quake of 2.2 followed by aftershocks of 1.7 to 2.1 occurred at about 3.5 miles beneath Mount Hood. Glaciers on Mount Hood retreated through the first half of the 20thcentury, advanced or at least slowed their retreat in the 1960s and 1970s, and have since returned to a pattern of retreat. Scientists expect the next eruption to consist of small explosions and the growth Lavaflows younger than 100,000 years old are found on most flanks of Mount Hood. In the recent past, Mount St. Helens in Washington is also an active volcano. significant quantities of snow and ice to produce lahars that flow down river Soc. generated by rapid erosion of loose rock during heavy rains or by sudden Still, the odds of an eruption in the next 30 years are estimated at between 3 and 7%, so the U.S. Geological Survey (USGS) characterizes it as "potentially active", but the mountain is informally considered dormant. Privacy Policy for more information about our privacy practices. Estimated The Mount Hood forest is home to approximately 1,000mi (1,600km) of trails. have a history of violent explosive eruptions. Much of Mt. How well the given earthquake location predicts the observed phase arrivals (in seconds). Fans of pyroclastic-flow andlahardeposits formed all around the volcano. Iceland has recorded more than 40,000 earthquakes in the past three weeks. Mount Hood is an active stratovolcano one built up by many layers that is 50 miles south of Portland in Oregon. Extrusion of summitlavadomesbuilt much of the summit region we see today. . 10. Hood took place more than 200 years ago? Visitors to Mount Hood frequently smell the "rotten egg" odor of the Andesite-dacite lava domes form the glacially eroded summit complex. In the last 1,500 years, Mount Hood has had two major eruptive periods that produced lava domes, pyroclastic flows and mud flows, and minor ash fallout. A few days later at what would become The Dalles, Clark wrote, "The pinnacle of the round topped mountain, which we saw a short distance below the banks of the river, is South 43-degrees West of us and about 37mi (60km). cold, windless days, a steam plume is often seen rising from the fumaroles. Modern sources suggest the peak of Mount Hood is around 11,249 feet, however,this figure has changed throughout the years. Most pyroclastic flows, lava flows, and NOTE: In Feb. 2012 a very small earthquake swarm took place resulting in ablog postingon the PNSN web pages. Volcano Number Last Known Eruption Elevation Latitude Longitude: 322010 1866 CE 3426 m / 11240 ft 45.374N 121.695W Volcano Types: Stratovolcano . and electronic equipment or make driving hazardous. Alaska, Hawaii, Washington, Oregon, and northern California all have active volcanoes. Their description is unlike the present gravel-bed river and suggests that the river was responding to an excessive sediment load imposed byvolcaniclasticdeposits emplaced during Old Maid eruptions. For some time, many references assumed Mount Hood to be the highest point in North America. Scientists Ash clouds from small explosions or Sometimes, instead of flowing slowly downhill, lava piles up over its vent They total over 4,600 acres (7.2sqmi; 19km2) of skiable terrain; Timberline, with one lift having a base at nearly 6,940ft (2,120m), offers the only year-round lift-served skiing in North America. named glaciers or snow fields, the most visited of which is Palmer Glacier, partially within the Timberline Lodge ski area and on the most popular climbing route. PNSN coordinates are referenced to the WGS84 ellipsoid. Seismologists usually use Coordinated Universal Time (UTC) to avoid confusion arising from mixing observations from different time zones. earthquakes beneath the volcano as magma moves towards the surface. 4) Drag square on line to include events to plot. Sahale became enraged and smote the three lovers. Renewed activity at most volcanoes begins with increasing numbers of About 10,000 people attempt to climb Mount Hood each year. Mount Hood is a stratovolcano, also known as a composite volcano. Their battle is said to have destroyed the Bridge of the Gods and thus created the great Cascades Rapids of the Columbia River.[21]. In 2014, a USGS employee, Dr. Seth Moran, proposed installing new instruments on Mount Hood to warn of volcanic activity. [58] The most popular route, dubbed the south route, begins at Timberline Lodge and proceeds up Palmer Glacier to Crater Rock, the large prominence at the head of the glacier. from pyroclastic flows can reach tens of thousands of feet in altitude, endangering The scar of this landslide forms the breached summit crater in which lava domes grew during the Timberline and later Old Maid eruptive periods. Acinder conewith flanking lava flows formed The Pinnacle on Hoods north flank about 130,000 years ago. Threat Potential:Very High*. near Crater Rock. In the mid-1800's, local The last known eruption of this volcano took place in 1865 and 1866 (VEI 2). Mauna Loa is the largest active volcano on the planet. Land Olallie lake in the foreground. a swarm to persist, for the number of earthquakes to increase dramatically, or Mount Hood, which has been active for at least 500,000 years, occupies a long-lived focus of volcanic activity that has produced ancestral Hood-like volcanoes for the past 1.5 million years. Cosigina is a stratovolcano, which is a cone-shaped volcano formed by alternating layers of solidified lava and volcanic rocks produced by explosive eruptions. Pyroclastic flows andlaharswere generated by repeated collapse of alavadomeextruded near the site of present-day Crater Rock, which is the surviving remnant of that dome. Snow and Ice. Got a news story you want to share? and lahars. See theblog for more details. A lahar What scientists are looking for as a sign of renewed activity is for Volcano Hazards in the Mount Hood Region, Oregon, U.S. Geological Survey Open-File The Cascade Range hosts many volcanic features. stratovolcano 3426 m / 11,240 ft Oregon (Canada and USA (mainland)), 45.37N / -121.7W Current status: normal or dormant (1 out of 5) The largest eruption in this period occurred on June 3, 1991, when a pyroclastic flow that reached 4.5 kilometres distance from the crater killed 43 people including the famous French volcanologists Katia and Maurice Krafft. reflect a vent located on the volcano's west, north, or east flank. and sizable parts of the volcano's flanks and formed lahars that flowed to the [24] A second ammunition ship, AE-29, was commissioned in May 1971 and decommissioned in August 1999. It is a dormant volcano that last erupted about 1865, with minor steam and ash (tephra) emissions in 1903; debris flows, glacial flooding, and earthquakes regularly occur there. equipment, frequently replacing air filters in machinery, wearing dust masks, and avoiding Then get in touch at [emailprotected]. Below you will find an epicenter map, time-depth plot and seismicity plot for a region around Mount Hood for the three decades, 1980 - 2010 that shows typical or background levels of earthquakes in this region. Participate in helping your community be prepared. Swarms of these types of events are fairly common on many volcanoes. Well-known landmarks around the volcano such as Gnarl Ridge, Lamberson Butte, Yocum Ridge, Illumination Rock, and the high rock cuts along U.S. 26 east of Government Camp are formed of lava flows from this time period. Minor amounts of tephra can make breathing difficult Secure .gov websites use HTTPS [59], Technical ice axes, fall protection, and experience are now recommended in order to attempt the left chute variation or Pearly Gates ice chute. The present summit was constructed within a large crater breached to the NE, formed by collapse during a major explosive eruption about 5,600 years ago that deposited the widespread Osceola Mudflow. Paradise Park, a popular destination on the Timberline Trail, is underlain by lava flows about 50,000 years old. travel time for lahars to reach these zones is more than 30 minutes, which may allow The last two periods of eruptive activity occurred about 1,500 years ago and in the late 18th century. Mount Hood is considered the Oregon volcano most likely to erupt,[9] The minimum magnitude to plot is selected by the slider. But by understanding how hot and cool magma mix, scientists say they may get better . 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