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| RIDGEMARK (KRON)– A 3.3 earthquake happened at 7:19 a.m this morning near Ridgemark, California. Ridgemark is part of San Benito County near Hollister. KRON 4 called USGS to confirm this information from USGS: |
M3.3 – 17km SSE of Ridgemark, California
Time
- 2015-06-07 14:19:38 (UTC)
- 2015-06-07 07:19:38 (UTC-07:00) in your timezone
- Times in other timezones
Nearby Cities
- 17km (11mi) SSE of Ridgemark, California
- 22km (14mi) SSE of Hollister, California
- 27km (17mi) N of Soledad, California
- 32km (20mi) E of Salinas, California
- 213km (132mi) S of Sacramento, California
Tectonic Summary
San Andreas Fault
The San Andreas Fault forms the main strand of the plate boundary,
running from the Gulf of California (Baja California, Mexico) north to
the region of Cape Mendocino. The fault in the San Francisco Bay region
is a largely strike-slip fault running through the Santa Cruz Mountains,
the Gulf of the Farallons west of the Golden Gate, through Tomales Bay
and Bodega Bay, and north to Fort Ross and Point Arena. Northward of
Point Arena, the location and character of the San Andreas Fault is less
well known. The fault in this region is locked, exhibiting no creep at
the surface and generating very few microearthquakes that are associated
with minor slipping at depth. Through the San Francisco Bay Area, the
slip rate on the San Andreas Fault is about 20 mm/yr (4/5 inch/year).
The October 17, 1989 Loma Prieta earthquake was the most recent major
earthquake associated with the San Andreas Fault. While the earthquake
was not produced by the main San Andreas Fault, it occurred on a closely
associated blind thrust fault that had formed as a result of a bend in
the San Andreas Fault, south of the bay. Although that earthquake struck
along a remote segment of the Santa Cruz Mountains, 64 deaths resulted,
most from the collapse of the Cypress Freeway in Oakland. About 16,000
homes and apartment units were uninhabitable after the earthquake. The
San Francisco-Oakland Bay Bridge was closed for more than a month
because of a collapse of a section of its eastern span.
The left bend in the San Andreas Fault in the Santa Cruz Mountains
favors thickening of the crust and uplift of the Earth’s surface, and is
thought to be responsible to the formation of the Santa Cruz Mountains.
The M7.9 April 18, 1906 San Francisco earthquake was the most recent
great earthquake on the San Andreas Fault and it ruptured from
approximately Cape Mendocino south to San Juan Bautista. The 1906
earthquake was the largest earthquake to strike Northern California in
historic times, and is thought to have killed more than 3,000 Bay Area
residents. The epicenter of that earthquake is now estimated to be
offshore about 2 miles west of San Francisco. The fire following the
1906 earthquake burned 5 square miles of San Francisco and resulted in
225,000 homeless refugees of the earthquake.
A large (magnitude 6.8) earthquake in 1838 is often assumed to have
occurred on the Peninsula segment of the San Andreas Fault. To date,
however, unambiguous observations placing that earthquake on the San
Andreas Fault have not been found.
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