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98693 |
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Date: December 05, 2024 at 13:16:55
From: jordan, [DNS_Address]
Subject: summary of 7.0 offshore northern California earthquake |
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On December 5, 2024, a Mww 7.0 earthquake struck off
the coast of Humboldt County, California, at 10:44 a.m.
PST.
The earthquake's epicenter was located offshore, 62 km
(39 mi) west of Petrolia and struck at a focal depth of
0.6 km (0.37 mi).[3] A similarly-sized earthquake of
identical mechanism occurred in the area in 1980.
Over 10,000 customers in Humboldt County were left
without power following the earthquake.[7] Initial
reports of damage included some homes being shifted from
their foundations in the Eel River Valley region
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[98694] |
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98694 |
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Date: December 05, 2024 at 13:18:46
From: jordan, [DNS_Address]
Subject: Re: summary of 7.0 offshore northern California earthquake |
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1980 event
The 1980 Eureka earthquake (also known as the Gorda
Basin earthquake) occurred on November 8 at 02:27:34
local time along the northern coastal area of California
in the United States. With a moment magnitude of 7.3 and
a maximum Mercalli intensity of VII (Very strong), this
strike-slip earthquake was the largest to occur in
California in 28 years. Although damage was considered
light, several loss estimates equaled or exceeded $2
million, and six injuries resulted when two vehicles
came down with the partial collapse of a highway
overpass on US 101 in Fields Landing. The north coast of
California experiences frequent plate boundary
earthquakes near the Mendocino triple junction and
intraplate events also occur within the Gorda plate.
The left-lateral strike-slip earthquake was the largest
to occur in California since the 1952 Kern County
earthquake. The mainshock (which was described as a
multiple-rupture, with four subevents in the initial 80
seconds) and its aftershocks occurred on a northeast-
trending fault that extended from near the Mendocino
Fault to a point northwest of Eureka. Movement along the
fault is due to a north–south compressional regime and
the resulting intraplate deformation of the Gorda plate.
Previous events in this area were the January 1922 7.3
Ms and the January 1923 7.2 Ms shocks
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