There are 9,702 earthquake incidents in Washington on record since 1931. Other evidence includes drowned groves of red cedars and Sitka spruces in the Pacific Northwest. The earthquake was characterized as a typical moderate-sized destructive event with a complex energy release signature. The region was part of Oregon Territory from 1848 to 1853, after which it was separated from Oregon and established as Washington Territory following the efforts at the Monticello Convention. The earthquake ruptured what is known as the Cascadia subduction zone -- the area of overlap between … 1 0 obj It had a moment magnitude of 6.9 and a maximum perceived intensity of X (Extreme) on the Mercalli intensity scale. At the time, this was a colonial territory of the Spanish Empire. The epicenter was offshore, southeast of Long Beach, California, on the Newport–Inglewood Fault. There were no reported casualties, but the event affected the then largely-uninhabited areas of northern Mexico and Southern California. Its magnitude has been estimated at Mw 7.4 to 7.9, with a maximum Mercalli Intensity of X (Extreme). 2 0 obj With a moment magnitude of 6.4 and a maximum Mercalli intensity of VIII (Severe), this earthquake left one person dead from a falling chimney and several injured. While shaking is driven by the seismic energy released by an earthquake, earthquakes differ in how much of their energy is radiated as seismic waves. Both shocks had an estimated Ms magnitude of 5.6, and a maximum Mercalli intensity of VII. Significant Earthquakes Experienced in Washington Since 1872 Note: Top 6 earthquakes with greatest impacts are preceded by ** and underlined 1800s **December 14, 1872 Washington State Earthquake The earthquake is the largest historical earthquake in eastern Washington, and the most widely felt earthquake in the state. This is a list of earthquakes in Washington, a U.S. state. The 1940 El Centro earthquake occurred at 21:35 Pacific Standard Time on May 18 in the Imperial Valley in southeastern Southern California near the international border of the United States and Mexico. The 1812 San Juan Capistrano earthquake, also known as the Wrightwood earthquake, occurred on December 8 at 15:00 UTC in Alta California. The 1949 Olympia earthquake occurred on April 13 at 11:55:44 local time with a moment magnitude of 6.7 and a maximum Mercalli Intensity of VIII (Severe). View the number of earthquake incidents in Washington by year. The 1892 Laguna Salada earthquake occurred at 23:20 Pacific Standard Time on February 23. Many homes and businesses were affected, along with roadway disruptions, mainly in Los Angeles and Orange counties. stream The largest earthquake on record for Washington occurred on 06/23/1946, with a depth of 35.0 miles and a magnitude of 7.6 on the Richter scale in Clallam County, WA. The 1940 New Hampshire earthquakes struck on December 20 and again on December 24. Tree ring and paleoseismic evidence show that there is a strong likelihood that the earthquake originated along the Mojave segment of the San Andreas Fault near Wrightwood, but other faults have been suggested as the cause. Damage occurred at several of the missions in the region of Pueblo de Los Ángeles, including Mission San Gabriel Arcángel and Mission San Juan Capistrano, where 40 parishioners were killed during the collapse of a church at an early morning service.
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