US: Bay Area earthquakes struck on unusual section of San Andreas fault - - PressFrom - US
  •   
  •   
  •   

US Bay Area earthquakes struck on unusual section of San Andreas fault

21:25  16 october  2019
21:25  16 october  2019 Source:   latimes.com

Officer Struck By Police Car While Chasing Gun Suspect In North Lawndale

  Officer Struck By Police Car While Chasing Gun Suspect In North Lawndale A Chicago police officer was injured after being struck by a car while pursuing a "potential gun offender" Thursday afternoon in the North Lawndale neighborhood. © Provided by CBS Local, a division of CBS Radio IncPolice said the officer was struck shortly after 1 p.m. in an alley on the 1800 block of South Drake. “Each day we’re combating violence and gun violence in the city of Chicago,” said Area North Deputy Chief Ernest Cato.He said police were monitoring a gang funeral and attempted to stop a vehicle after a person threw a handgun out of the car window. The gun was later recovered.

The magnitude 4.7 earthquake Tuesday east of Monterey Bay hit on a unique section of the San Andreas fault that has long generated interest from scientists.

a sign on the side of a road: A file photo shows a sign in Parkfield, Calif., advising motorists they are crossing over the San Andreas fault.© Spencer Weiner / Los Angeles Times A file photo shows a sign in Parkfield, Calif., advising motorists they are crossing over the San Andreas fault.

The quake was felt across a wide area and caused no major damage. It was followed Wednesday morning with a 3.4 magnitude aftershock. But it offered a reminder of the San Andreas' presence as a dangerous seismic presence in California.

The 'creeping' section

San Francisco Bay Area rattled by 4.5 earthquake

  San Francisco Bay Area rattled by 4.5 earthquake A magnitude 4.5 earthquake was felt widely in the San Francisco Bay Area on Monday evening at 10:33 p.m., with the epicenter in the Walnut Creek and Pleasant Hill areas. Moderate shaking was felt in the Pleasant Hill, Walnut Creek and Concord areas of an intensity that can overturn unsecured objects, such as books and picture frames, and is capable of breaking dishes or windows. Weak shaking was felt in San Francisco, Oakland and San Jose, according to the U.S. Geological Survey. In Fremont, one woman felt short shaking of just 2 seconds.

The San Andreas fault has produced devastating quakes in Northern and Southern California.

But Tuesday's quake occurred along a section that is notable for not having had dramatically large earthquakes in the modern historical record. Keith Knudsen, USGS geologist and deputy director of the agency's Earthquake Science Center, called Tuesday's quake "a garden variety San Andreas event" in this section.

"This is the 10th earthquake larger than magnitude 4 in the last 20 years in this area" within a radius of about six miles from Tuesday's epicenter, Knudsen said.

Power to the north and south

The stretches of San Andreas north and south of the creeping section have acted very differently in the modern historical period, rupturing in the state's largest catastrophic quakes on record.

Nearly half of US oil refineries are in states hit by earthquakes and hurricanes

  Nearly half of US oil refineries are in states hit by earthquakes and hurricanes California, Texas and Louisiana represent almost half of all oil refineries in the US. They also have something else in common -- they are prone to natural disasters. Hurricane Harvey crippled refineries after the 2017 storm devastated parts of Texas and Louisiana. About 2.4 million barrels of daily refining capacity in Texas remained offline two weeks after, according to S&P Global Platts. That's about 13% of the country's total ability to turn oil into gasoline, jet fuel and other products.The Gulf of Mexico is one of the most important regions for energy resources and infrastructure, the EIA says.

About 300 miles of the northern San Andreas fault, between San Juan Bautista in San Benito County and Cape Mendocino, ruptured in the great 1906 earthquake that destroyed much of San Francisco in shaking and fire.

A 225-mile stretch of the southern San Andreas fault south of this creeping section, from Parkfield in Monterey County to Wrightwood in San Bernardino County, ruptured in the great 1857 earthquake, the most powerful event in modern Southern California history.

Both quakes are estimated to have been magnitude 7.8.

The 90-mile creeping section between San Juan Bautista and Parkfield hasn't seen a big earthquake in the modern record. Scientists are continuing to study whether big earthquakes can continue to rupture through the creeping section of the San Andreas.

A lurking danger

A big quake on the northern or southern San Andreas would be devastating.

Strong quake in Philippines sends people scrambling

  Strong quake in Philippines sends people scrambling PHILIPPINES-EARTHQUAKE/ (UPDATE 2, PIX, TV):UPDATE 2-Strong quake in Philippines sends people scrambling

The U.S. Geological Survey published a hypothetical scenario of a magnitude 7.8 earthquake on a 185-mile stretch of the southern San Andreas fault, from Imperial County to Los Angeles County

. In this scenario, the quake would kill 1,800 people, injure 5,000, displace some 500,000 to 1 million people from their homes and hobble the region economically for a generation.

It also would send strong shaking into Los Angeles, Orange, Riverside, San Bernardino, Kern and Ventura counties within minutes.

Here's a list of strong quakes on the San Andreas fault over the past 200 years, according to the USGS and California Geological Survey:

1812, southern San Andreas and parts of San Jacinto fault, magnitude 7.5: Destroyed the Great Stone Church at Mission San Juan Capistrano, killing more than 40 people attending Mass.

1838, northern San Andreas fault, magnitude 7.4: Damage

was reported from San Francisco to Santa Clara, fault likely ruptured between Woodside on the peninsula south of San Francisco to Watsonville.

1857, southern San Andreas fault, magnitude 7.8: Ruptured fault from southernmost Monterey County to Cajon Pass in San Bernardino County; damage was reported from Monterey County to Los Angeles County.

1890, northern San Andreas fault, magnitude 6.8: East of Watsonville; damage was reported in San Benito and Santa Cruz counties.

1906, northern San Andreas fault, magnitude 7.8: Great San Francisco earthquake; the San Andreas produced shaking waves from a long stretch of the fault, from Mendocino County to San Benito County. Experts estimate more than 3,000 deaths were caused, directly or indirectly, by the earthquake.

Earthquake: 3.7 quake rattles Los Angeles area, centered in Compton .
A magnitude 3.7 earthquake rattled parts of the Los Angeles area early Friday. The quake hit at 12:19 a.m. Friday in Compton near the corner of Compton Boulevard and Alameda Street. According to the U.S. Geological Survey, the temblor was felt from Orange County to the San Fernando Valley. The quake hit at 12:19 a.m. Friday in Compton near the corner of Compton Boulevard and Alameda Street. According to the U.S. Geological Survey, the temblor was felt from Orange County to the San Fernando Valley.

—   Share news in the SOC. Networks

Topical videos:

usr: 8
This is interesting!