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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.

The Global Water Crisis: Why Are India’s Taps Running Dry?

  The Global Water Crisis: Why Are India’s Taps Running Dry? Towards the end of May, one of India’s most popular summer retreats nearly ran out of water. Shimla, a historic hill town in the northern state of Himachal Pradesh, is the latest addition to a list of Indian towns and cities that are starved for water. Earlier this year Bangalore, home to the country’s information technology sector, made it to a list of world cities most likely to run out of drinking water. It joins other parched metropolises like Cape Town, Jakarta and Sao Paolo.Residents of Shimla had to wait nearly four days to get water, with many lining up with buckets to collect water from tankers.

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.

Japan volcano featured in "James Bond" movie erupts, ejecting smoke and rocks .
A Japanese volcano that figured in a 1960s James Bond movie erupted explosively on Friday for the first time since April, sending smoke thousands of meters into the air, less than a week after a strong earthquake shook the country's west.Shinmoedake, in a mainly rural area about 985 km (616 miles) from Tokyo on the southernmost main island of Kyushu, had quietened down since the earlier eruption, although admission to the 1,421-meter- (4,662-ft-) high peak remained restricted.

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