Among the more seriously damaged buildings were the state capitol in Salem and Molalla High School. m_gallery_id = "17299979"; The mainshock was located at 45.033°N, 122.586°W and at a depth of about 15.1 km, based on arrival time data from the short-period Pacific Northwest Seismograph Network. Since nothing can be done to prevent an earthquake, the best thing, officials say, is to be prepared. The most recent earthquake along a similar fault in the region was a magnitude-5.7 quake in March 1993 just south of Portland, which caused $30 million in damage, the authors wrote. Here is every earthquake recorded over the last 30 days by the U.S. Geological Survey. [10], "The 1993 Klamath Falls, Oregon, earthquake sequence: Source mechanisms from regional data", "Klamath Falls earthquakes, September 20, 1993 - Including the strongest quake ever measured in Oregon",, September 1993 events in the United States, 1993 natural disasters in the United States, Creative Commons Attribution-ShareAlike License, This page was last edited on 7 May 2020, at 11:08.

In 1993 western Oregon experienced two damaging earthquakes, Scotts Mills (magnitude 5.6) and Klamath Falls (magnitudes 5.9 and 6).

The strongest earthquake to hit the Pacific Northwest in years rumbled through Oregon this morning, cracking the Capitol rotunda, collapsing walls at a high school and jolting people awake.

These were helpful in recording subsequent seismic activity. Studies show that in the past 7,000 years as many as 13 "superquakes" measuring magnitude 8 or 9 ruptured a 1,000-mile-long zone off the Pacific Coast where huge plates of Earth's crust collide. They regularly issue news releases and warnings about the importance of being ready for such an event because research shows the region could suffer a "megaquake" of the type that hit the region on Jan. 26, 1700, at any time. Registration on or use of this site constitutes acceptance of our User Agreement, Privacy Policy and Cookie Statement, and Your California Privacy Rights (each updated 1/1/20). The strongest earthquake to hit the Pacific Northwest in years rumbled through Oregon this morning, cracking the Capitol rotunda, collapsing walls at a high school and jolting people awake. [5] There were only two recorded casualties, one of which involved a motorist who was crushed in a rock slide on Route 97. The 1993 Klamath Falls earthquakes took place in Klamath Falls, Oregon, beginning on Monday, 20 September at 8:28 p.m. m_gallery_pagetype = "embed"; The earthquakes were located at a depth of 5.6 miles (9 km) and tremors continued to be felt more than three months after the initial shocks. Damage estimates reached about $28 million in 1993 dollars. Bulletin of the Seismological Society of America ; 86 (4): 925–935.

The two largest earthquakes in recent years in Oregon, Scotts Mills (magnitude 5.6) and the Klamath Falls main shocks (magnitude 5.9 and magnitude 6.0) of 1993 were crustal earthquakes. [3][4] Previously most tremors measured less than 4 Mw with the strongest being 4.3 Mw in 1948. Bulletin of the Seismological Society of America (1996) 86 (4): 925–935.

1993-03-25 13:34:35 UTC 5.4 magnitude, 0 km depth Molalla, Oregon, United States 5.4 magnitude earthquake 1993-03-25 13:34:35 UTC at 13:34 March 25, 1993 UTC You could not be signed in. The March 1993 Scotts Mills earthquake (M5.6) and the September 1993 Klamath Falls earthquakes (M5.9 and M6.0) demonstrated the potential hazards of crustal earthquakes in Oregon. Bulletin of the Seismological Society of America, Late Quaternary Climate, Tectonism, and Sedimentation in Clear Lake, Northern California Coast Ranges, The 2011 Mineral, Virginia, Earthquake, and Its Significance for Seismic Hazards in Eastern North America, Backbone of the Americas: Shallow Subduction, Plateau Uplift, and Ridge and Terrane Collision, Paleozoic Stratigraphy and Resources of the Michigan Basin, This site uses cookies. [1], These fault networks have caused several previous earthquakes in the Klamath Falls area. [3][4] The major shocks were felt as far north as Eugene, Oregon, and as far south as Redding, California. At 5:34 a.m. on March 25, 1993, one of the stronger earthquakes to hit the area in years jolted residents from Salem to Portland awake. The Richter magnitude 5.6 earthquake occurred near the small town of Scotts Mills, 48 km south of Portland, Oregon.

A re-examination of the 1947 Manix, California, earthquake sequence and comparison to other sequences within the Mojave block, Seismicity associated with a recent earthquake of, Crustal Structure and Fault Geometry of the 2010 Haiti Earthquake from Temporary Seismometer Deployments, Source Parameters of the Shallow 2012 Brawley Earthquake, Imperial Valley, Focal Depth Determination for Moderate and Small Earthquakes by Modeling Regional Depth Phases, Seismicity in the Clear Lake area, California, 1975–1983, Shear-wave velocity structure and attenuation derived from aftershock data of the 2011 Mineral, Virginia, earthquake, Regional seismic-wave propagation from the M5.8 23 August 2011, Mineral, Virginia, earthquake, Ground-motion site effects from multimethod shear-wave velocity characterization at 16 seismograph stations deployed for aftershocks of the August 2011 Mineral, Virginia, earthquake, Flat-slab subduction and crustal models for the seismically active Sierras Pampeanas region of Argentina, Porosity characterization in a Silurian reef, northern Michigan Basin, using azimuthal seismic data and potential impacts for enhanced oil recovery, Copyright © 2020 Seismological Society of America. m_gallery_permalink = ""; "We are poorly prepared for a major earthquake anywhere in the region.". Such a quake would probably kills scores if not hundreds and do as much as $30 billion in damage to the area. You do not currently have access to this article. At 5:34 a.m. on March 25, 1993, much of northwestern Oregon and southwestern Washington was shaken by one if the largest historic earthquakes ever observed in the region. The West Klamath Lake fault zone is capable of earthquakes up to Richter magnitude 7.3.
m_gallery = "the_1993_spring_break_earthqua"; ''It reminds us that we have to get ready. Molalla High School and the State Capitol building were severely damaged.

This content is PDF only. Officials said it appeared that the rotunda was shifted and that the gold-plated pioneer figure on top of the Capitol might have to be removed. As reported in The Oregonian the next morning: ''This is not a unique event, it is not a surprise,'' said Ian P. Madin, a seismic hazard specialist with the Oregon Department of Geology and Mineral Industries. [9] The second death was a result of a heart attack. Occasionally the digitization process introduces transcription errors or other problems; we are continuing to work to improve these archived versions. [7][8], The epicenter of both earthquakes was located northwest of Klamath Falls in the Mountain Lakes Wilderness. The National Earthquake Center in Golden, Colo., recorded the quake's magnitude at 5.3.

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