The South Napa earthquake occurred on Sunday, 24 August 2014 at 3.20 am local time at a depth of 10.7 km, having MW 6.0 and causing significant damage to unreinforced masonry (URM) buildings Earthquake Science Center, Menlo Park, California. With one fatality, and approximately a half billion dollars of economic damage, the city of Napa is still recovering from last year’s quake. State Sen… The 6.0-magnitude quake struck at 3:20 … The M6.0 South Napa earthquake occurred on August 24, 2014. The length of the rupture was about 12.5 km (8 mi), and scientists measured up to 46 cm (18 in) of slip. All of the faults and/or imagery lineaments shown as heavy green lines on this map may be considered to have a low level of afterslip hazard. The ground shaking was very strong along the fault and in the Napa Valley. The discharge of springs and groundwater to these streams began within an hour after the earthquake, increasing intermittently from 0.1 to nearly 3 cubic feet per second within a couple of weeks. Over 41,000 people went online to report what they felt during the event. This earthquake was unusual for its size, because it had a relatively long surface rupture of 12.5 km (8 mi) with a significant amount of surface slip (up to 46 cm; or 18 in). These recordings are being used, in part, to better understand the performance of residences and older masonry buildings that have been retrofitted. The Did You Feel It? Hurricane Marie peaked on 8/24 at 21 UTC - about 2 hours from the Peru earthquake. The Earthquake Event Page application supports most recent browsers, view supported browsers. An Instrumental Intensity “ShakeMap,” depicts the ground shaking produced by the 2014 South Napa earthquake. ), Napa Valley area red- and yellow-tagged structures shown as red and yellow squares. The California Integrated Seismic Network detected the South Napa earthquake immediately, and the first ShakeMap, issued four minutes after the earthquake, depicted the violent shaking in the immediate area. The first PAGER Assessment (providing fatality and economic loss impact estimates) was issued 13 minutes after the earthquake, and accurately forecast a low level of human casualties, but significant economic losses in the area. First, to put the South Napa earthquake in context, the West Napa fault, which was the causative fault, is part of the large San Andreas Fault Zone (SAFZ) system. These measurements are probably minimums for the zone since the deformation was probably distributed over an area of several meters wide. The South Napa earthquake included a few small segments that ruptured together to produce the M6 earthquake.. Many California residents have the Did You Feel It? Click on a pin on the map to see more information. The Mw 6.0 South Napa earthquake of August 24, 2014, produced complex and extensive surface faulting and other ground deformation features. In addition, a M3.0 earthquake occurred on August 5, 2014, 19 days before the M6.0, which, in retrospect, some scientists/seismologists might consider a foreshock. It was the biggest temblor to hit the Bay Area since the M6.9 Loma Prieta earthquake of 1989. For example, the surprising amount of afterslip observed gave scientists a new way to look at and forecast continuing hazards in the weeks to months, after the earthquake occurred. The magnitude 6.0 earthquake occurred early in the morning on August 24, 2014, on the West Napa Fault. In the month after the mainshock, there were 80 aftershocks of magnitude greater than or equal to 1.8. LOS ANGELES _ In a land where the mildest rumble elicits an anxious question _ "Did you feel that?" (Josh Edelson/AFP/Getty Images) Kids skateboard over buckled roads in a residential neighborhood of Napa. The SAFZ is not a simple, single fault, but rather a complex collection of smaller fault segments that collectively accommodate the horizontal movement between the North American Plate and the Pacific Plate. The drought-induced low water table and dry ground inhibited landslides and liquefaction that can occur during earthquakes of this size, sparing the area greater damage than could have been. Open-File Report 2014–1249 >> Pubs Warehouse > OF 2014–1249. Overview. The South Napa earthquake was very well recorded and produced a number of strong ground motion recordings that are of considerable interest to the engineering community. Global predictions for localized events were posted on Astrosymm.com on 6/14/14. The change occurred within 1 hour after earthquake, but the discharge amount returned to normal within a few days. Where I was in San Francisco wasn’t close enough to the epicenter to do much other than wake people up. And I am listening to KTVU TV News right now, … Ongoing fault movement along the surface rupture, called afterslip, continued for several months, and caused further damage to foundations and structures. One year ago, the largest earthquake in over 25 years hit the San Francisco Bay Area, causing significant damage in California’s famous Napa Valley. This anniversary of the event is a time to look back at what the U.S. Geological Survey and its scientific partners have learned from the South Napa Earthquake. Copy Link. USGS Geologists inspecting fault trace in a trench dug across one of the ruptures from the 2014 South Napa earthquake. The August 24, 2014, South Napa earthquake (M6.0) produced significant damage resulting from shaking, fault rupture, fault afterslip, and ground deformation. Q. A shaking intensity of VII-VIII is described as strong to severe, and very likely woke up all but the most heavy of sleepers. _ having even a few seconds of warning before an earthquake An earthquake measuring an estimated 6.0 struck southern Napa County at 3:20 a.m. on Aug. 24, 2014 with widespread reports of damage throughout … The 2014 South Napa earthquake occurred in the North San Francisco Bay Area on August 24 at 03:20:44 Pacific Daylight Time. The West Napa fault extends along the western margin of the basin that underlies much of Napa Valley. When the pressure adjusts and equilibrates with the water table, the flow will often return. It may extend further north or south and may connect with other fault zones. Damage to structures decreased with distance from the rupture. Cullen 328 Let's discuss it 05:47, 26 August 2014 (UTC) This article in the San Jose Mercury News, published about 80 miles away, specifically mentions that "South Napa Earthquake" is emerging as the accepted name. ), These two photos showing evidence of afterslip were taken where the fault crosses Highway 12 (south side of the highway) at Cuttings Wharf Road. The six traces are labeled A-F. Pavement buckling and tented sidewalk resulting from compressional forces at north end of main fault rupture, Sandybrook Lane, Napa California. The city of Napa was very strongly shaken: many historical masonry buildings and older residences were damaged. For example, the California Department of Transportation (Caltrans) received an automated report that they could use to determine which bridges and overpasses experienced the greatest level of shaking and were most at risk to damage so they could prioritize inspections. Sometimes a single fault segment will slip and cause an earthquake, and other times many fault segments slip in unison, causing a larger earthquake. the sedimentary basin - soft sediments amplify the shaking. In response to this earthquake, the Special Projects task of the National Earthquake Technical Assistance Program (NETAP) under FEMA Contract HSFE60-12-D-024 with the Applied Technology Council (ATC) A smaller magnitude 5.0 earthquake on the same fault had damaged the city of Napa in 2000. The epicenter of that earthquake was 20 km (12 mi) NNW of the South Napa epicenter, and also on the West Napa fault system. Fault traces and other lineaments show levels of afterslip hazard. USGS geologists and geophysicists, along with their colleagues from federal, state, and local government agencies and academia, started conducting field work immediately after the earthquake. One year ago, the largest earthquake in over 25 years hit the San Francisco Bay Area, causing significant damage in California’s famous Napa Valley. M 6.0 - South Napa Warmer colors represent stronger shaking. Key Recovery Factors for the August 24, 2014, South Napa Earthquake. Afterslip is a slow movement on the fault, and it is yet unclear whether it is associated with, or independent of, the aftershocks. ), -written by Lisa Wald, U.S. Geological Survey. At 6.0 on the moment magnitude scale and with a maximum Mercalli intensity of VIII ( Severe ), the event was the largest in the San Francisco … There was one fatality due to the earthquake, and at least $500 million in economic losses. In the case of re trospective full-waveform inversions, a network with station spacing of 10km within the epicentral distanc e of 30km is able to provide adequate stable key source parameters if the preestimated hypocenter and fault ori entation are accurate of ±5km and ±15°, respectively. 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