Eleven hospitals had to be shut down due to heavy damage, which caused other hospitals to be overburdened with incoming patients injured from the earthquake. Many of these earthquakes occurred in Alaska. It caused the deaths of 63 people and injured nearly 4,000 others. Salt Lake City lies at the eastern boundary of the Significant shaking was felt in About an hour after the earthquake, users of social media began to spread rumors stating that another, much larger earthquake would occur in On the night of April 14, 2020, about a month after the main shock, a 4.2 magnitude aftershock occurred. The duration of the event is estimated at one to three minutes, and aftershocks continued to shake the area for over a year.Fortunately, the large area affected by the quake was very sparsely populated at the time, and there were very few reported deaths. Craters and fissures from this earthquake were observed over an area of 500 square miles. It is estimated that the epicenter of this M7.5 earthquake was near modern-day Wrightwood, Orange County, and the lateral extent could have extended into the San Bernardino Valley. Liquefaction occurred in San Francisco's Marina District where the soil conditions (loose sandy fills above deep soil deposits) amplified the ground shaking. It was the strongest in the region since written recordkeeping began in 1776 and was called the "Great San Francisco Earthquake" until the more damaging 1906 quake occurred. However, for the past three centuries, these plates have been locked together, generating enormous stresses.If this earthquake were to recur today, major cities affected would include Seattle, Portland, Vancouver, Victoria, and Tacoma. In San Francisco and Oakland, reinforced concrete viaducts collapsed, resulting in heavy damage to U.S. Highway 101 and Interstate 280 in San Francisco; and to Interstate 880 in Oakland. The coast of Southern California and farther inland was sparsely populated with Spanish colonists and missionaries, and Native Americans. This earthquake created the longest fault rupture ever observed in the continental United States, extending nearly 300 miles along the northern San Andreas Fault. Shaking was intense across the Bay in parts of San Francisco, which suffered an estimated USD 350,000 in property damage (1868 currency)—by far the highest concentration of both exposure and loss.
Overpass collapses occurred on the Santa Monica, Simi Valley, and Golden State freeways, among others.Most of the buildings that were damaged were multi-story wood frame buildings, especially those with a "soft story,” (e.g., those with parking areas or other large open spaces on the ground floor). Major structural damage was also reported at Mission San Gabriel Arcángel, and minor damage was reported at missions San Fernando Rey and San Buenaventura to the north in what is now Ventura, California. The megathrust earthquake involved the Juan de Fuca Plate from mid-Vancouver Island, south along the Pacific Northwest coast as far as northern California. Horizontal displacement was observed in many areas with the largest at 21 feet near Point Reyes Station in Marin County.
10.67 m: 0: 03/28/1964: Earthquake, landslide in the United States (Prince William Sound, Ak) with a magnitude of 9.2. The State of California reduced the extent of coverage that insurance companies were mandated to offer to a "mini-policy" and in September 1996 the California Legislature created the California Earthquake Authority to make minimal On the morning of October 21, 1868, an M7.0 earthquake struck the San Francisco Bay Area. In Monterey Bay, liquefaction caused underground pipes to break and also caused significant and widespread damage to buildings, bridges, highways, and port facilities. Pipelines were broken—shutting off water supply to the city—and roads were impassable, which in turn made it impossible to fight the fires that ignited due to overturned stoves and broken gas lines.
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