Earthquake Thread ~ Always Updated

Earthquakes of California: 1989 - 2019

On July 5, 2019, the largest earthquake to strike California in 20 years occurred near the town of Ridgecrest with a moment magnitude of 7.1 following a magnitude 6.4 foreshock on the previous day. The National Tsunami Warning Center (NTWC) in Palmer, Alaska, has the primary responsibility for determining whether earthquakes in the continental United States, including California, pose a tsunami threat. The Pacific Tsunami Warning Center (PTWC) also monitors these earthquakes in case it has to provide back-up service for NTWC . While California produces many earthquakes, most are too small, too far from the ocean, and/or move the earth in such a way that they are unlikely to produce tsunamis, though there are exceptions.

This animation covers a period of 30 years to put the Ridgecrest earthquakes in context and show how they compare with other recent, noteworthy earthquakes including:

Oct 10, 1989 -- Loma Prieta -- 6.9 Mw
Apr 25, 1992 -- Cape Mendocino -- 7.2 Mw (caused a small tsunami) (1st Quarter 9th)
Jun 28, 1992 -- Landers -- 7.3 Mw (New Moon June 28th)
Jan 17, 1994 -- Northridge -- 6.7 Mw (1st Quarter 19th)
Oct 16, 1999 -- Hector Mine -- 7.1 Mw (1st Quarter 17th)
Dec 22, 2003 -- San Simeon -- 6.6 Mw (New Moon 22nd)
Apr 4, 2010 -- Baja California (Mexico) -- 7.2 Mw (Waning gibbous with Last quarter on the 5th)
Aug 24, 2014 -- South Napa -- 6.0 Mw (New Moon 25th)
Jul 4, 2019 -- Ridgecrest -- 6.4 Mw (New Moon 3rd)
Jul 5, 2019 -- Ridgecrest -- 7.1 Mw

Magnitude 2.9
Region YELLOWSTONE NAT. PARK, WYOMING
Date time 2019-07-23 06:40:29.6 UTC
Location 44.58 N ; 110.76 W
Depth 8 km

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The group extends for about 160 km (99 mi) in a northwest-southeast direction. The islands are heavily glaciated and of volcanic


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6.0

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shallow

Ello Xx