Wednesday, October 16, 2019

A second quake felt in San Francisco area in a matter of hours.

SALINAS, Calif. – A magnitude 4.7 earthquake shook the ground in Salinas around 12:42 p.m. local time Tuesday, according to the U.S. Geological Survey. It came hours after a magnitude 4.5 quake hit the San Francisco Bay Area.
The latest quake was downgraded from a magnitude of 5.0 and was centered in Tres Pinos. That location is about 100 miles south of the site of the previous temblor, which occurred at 10:33 p.m. PST Monday night, with an epicenter in Pleasant Hill and Walnut Creek.
During the first quake, weak shaking was felt in San Francisco, Oakland and San Jose, per the USGS. A 2.5 magnitude foreshock also took place 10 minutes earlier near Pleasant Hill.
While there were reports of shaking felt in the San Francisco region from both quakes, the two temblors occurred too far apart to be related, according to Veteran seismologist Lucy Jones.
The latest earthquake's epicenter was in a rugged mountain range, with agricultural areas to the west.
The earthquakes took place days before the 30th anniversary of the 1989 Loma Prieta earthquake. The 6.9 magnitude earthquake killed 63 people and injured thousands.
Many locals took to Twitter to share their unease at the overnight taking place almost exactly three decades after the deadly shock.

Our software run the external stresses in the region as we posted in the previous post here  show it is about a distance 1 degree away. The near stress spot is about the same distance from the two earthquakes of today there in the region, see the map below.

MagnitudeMw 4.8
Date time2019-10-15 19:42:30.6 UTC
Location36.65 N ; 121.27 W
Depth10 km
Distances398 km NW of Los Angeles, United States / pop: 3,793,000 / local time: 12:42:30.6 2019-10-15
215 km S of Sacramento, United States / pop: 467,000 / local time: 12:42:30.6 2019-10-15
25 km SE of Hollister, United States / pop: 35,000 / local time: 12:42:30.6 2019-10-15
20 km SE of Ridgemark, United States / pop: 3,100 / local time: 12:42:30.6 2019-10-15

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