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Offbeat 2014 Napa earthquake may be linked to groundwater changes, study says

15:22  14 june  2018
15:22  14 june  2018 Source:   latimes.com

Study finds possible deep faults, possible earthquake source

  Study finds possible deep faults, possible earthquake source Scientists may have found previously unmapped faults in Oklahoma that could be contributing to a sharp increase in induced earthquakes in the state, according to a report on a study that used magnetic imaging to explore the rock formations below the earth's surface.The apparent faults extend from what appeared to be the end of mapped faults directly to areas where many quakes occurred, Oklahoma Geological Survey Director Jeremy Boak said Tuesday."This study reallyThe apparent faults extend from what appeared to be the end of mapped faults directly to areas where many quakes occurred, Oklahoma Geological Survey Director Jeremy Boak said Tuesday.

Surface ruptures from the August 2014 South Napa earthquake run through a vineyard near Buhman Road, Napa Valley, California. Credit: Dan Ponti, US Geological Survey. A summertime expansion in the Earth 's crust caused by changes in groundwater may have triggered the

Amos said linking earthquakes to groundwater removal isn’t unprecedented — one study found a 2011 magnitude 5.1 earthquake in Lorca, Spain may have been triggered by groundwater extraction in the region.

a person standing in front of a building: FILE - In this Aug. 25, 2014 file photo, two men walk past the earthquake-damaged building that housed the Carpe Diem wine bar in Napa, Calif. New research suggests the magnitude 6.0 earthquake that rocked California wine country in August 2014 may have been caused by an expansion of Earth's crust due to seasonally receding groundwater under the Napa and Sonoma valleys. (AP Photo/Eric Risberg, File) © Eric Risberg / AP FILE - In this Aug. 25, 2014 file photo, two men walk past the earthquake-damaged building that housed the Carpe Diem wine bar in Napa, Calif. New research suggests the magnitude 6.0 earthquake that rocked California wine country in August 2014 may have been caused by an expansion of Earth's crust due to seasonally receding groundwater under the Napa and Sonoma valleys. (AP Photo/Eric Risberg, File) Research suggests the magnitude 6.0 earthquake that rocked California wine country in 2014 may have been caused by an expansion of Earth's crust because of seasonally receding groundwater under the Napa and Sonoma valleys.

Strong earthquake near Osaka, Japan, causes scattered damage

  Strong earthquake near Osaka, Japan, causes scattered damage A strong earthquake shook the city of Osaka in western Japan on Monday morning, causing scattered damage including broken glass and partial building collapses. The quake with a preliminary magnitude of 5.9 struck around 8 a.m. about 10 kilometers (6 miles) underground, the Japan Meteorological Agency said. The strongest shaking was in an area north of Osaka city, the agency said.

Bricks from a damaged building sit on a car following the recent Napa earthquake . If anything, he believes increased San Andreas seismicity linked to groundwater pumping may actually be good news Of course, that’s not to say that groundwater overuse itself is something to be celebrated.

More information: Changes in groundwater chemistry before two consecutive earthquakes in Iceland, Nature Geoscience ( 2014 ) DOI: 10.1038/ngeo2250. Scientists find link between increases in local temperature and antibiotic resistance. May 21, 2018.

The vineyard-filled valleys flank the West Napa Fault, which produced the quake that killed one person, injured several hundred and caused more than $500 million in losses.

The study recently published in the American Geophysical Union’s “Journal of Geophysical Research: Solid Earth” suggests land between the valleys is stretched each summer as groundwater levels fall beneath the valleys and the ground in the valleys sinks and contracts.

The amount of the horizontal stretching measured is tiny — about 0.12 inch — but enough to stress faults, according to the researchers.

“We think it’s more of a localized effect, something related to the groundwater system. We don't know if it is groundwater pumping specifically, or something related to how the natural aquifer system works, or a combination,” said lead author Meredith Kraner, formerly of the Department of Geosciences at Stony Brook University in New York and now with the University of Nevada, Reno.

Co-authors were William E. Holt of Stony Brook University and Adrian A. Borsa of the Scripps Institution of Oceanography at UC San Diego.

The early morning Napa quake on Aug. 24 was the largest to hit the Bay Area since the magnitude 6.9 Loma Prieta earthquake on Oct. 17, 1989.

The Napa quake left 8 miles of surface rupture and damaged many historical masonry buildings and older residences, according to the U.S. Geological Survey.

Tainted pomegranate kills Australian woman .
An Australian woman has died after contracting hepatitis A from a packet of frozen pomegranate. The 64-year-old died in South Australia last week in a "rare and tragic" case, state health authorities said.Local officials issued a warning about the Australian-owned Creative Gourmet product in April. It has been linked to 24 cases of hepatitis A nationally.Australians have been urged to check their freezers and discard packets of the frozen fruit.About 2,000 packets of the Egyptian-grown pomegranate arils were sold. Fresh pomegranate and locally grown products were not affected, authorities said.

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