Download scientific diagram | Geophysical model through the 2000 Yountville earthquake. This technique is based on coupled traveling wave scat. The West Napa Fault is a 57 km (35 mi). By Steve Rubenstein. In the same 2014 study led by Butler, researchers simulated the tsunami from a 9. 413°W; 9. 2 earthquake near Yountville, California. The M s 7. 09/03/2000 01:36 PDT. "The M 6. 2, 9/03/2000, 08:36:30 (UTC), 01:36:30 AM (PDT), 38. 2 rattles Northern California's wine couuntry, taking place along a previously undiscovered fault line and surprising seismologists; epicenter is three miles. Presented is an analytical study of chimneys to assess key factors affecting behavior. We show for the 3 September 2000 Yountville earthquake that reported source parameters accurately predict waveforms at two close strong-motion stations (approximately 10 km from the epicenter). 0 Yountville earthquake was the most recent prior damaging earthquake on the WNFZ. The M5. 1 M w: VII 4–5 Limited 1994-01. The earthquake had a magnitude estimated at 6. 2, but caused more than $50 million damage in the Napa area. 3 Mare Island earthquake occurred in the vicinity of yesterday’s earthquake. UC Davis is ranked as having the highest impact ofNew gravity data refine the basin structure beneath the city of Napa, California and suggest continuity of the West Napa fault to the SE, near the city of Vallejo. 5 or greater) 5 earthquakes in the past 24 hours. This list may not reflect recent changes. It was felt in many parts of Northern California, including the Bay Area, the Sacramento area and Santa Rosa. At 6. A preliminary 2. 0 0. 5 miles west of Yountville, 7 miles. 7 nm: N: Harlan Estate: 3. Many strong motion instruments captured the. . The epicenter (38°22. a strand of the West Napa. , 2000 ). 0 . The 1898 M6. 0 magnitude, 10 km depth Yountville, California, United States 5. 8 km) south southwest of Yountville, California in the Mayacamas Mountain Range under Mount Veeder and about 9 miles (14 km) southThe 1971 San Fernando earthquake occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. 3, 2000. With a moment magnitude of 6. 6. Manual de buenas prácticas y recomendaciones sísmicas. 0) and 2014 South Napa (M6. toward Napa, where it produced damage. The epicenter of the 2000 ML 5. 9 earthquake near Yountville is shown as a white star, and the South Napa earthquake is shown as a yellow star. Making a ShakeMap ShakeMap relies primarily on observed ground motion shaking levels determined rapidly from free-field strong motion seismic instruments. Over the last few years, a number of works have focused on the effects of near-fault motions on different types of. The 2000 Yountville earthquake occurred with a moment magnitude of 5 on a previously unmapped fault, about 3 miles (4. Wald, Bruce C. Strong motion instruments recorded unusually high levels of shaking in the city of Napa as a result of the September 3rd Magnitude-5. 5 km onto model. 7级），震源深度约9千米，最大震度6强（日本氣象廳震度等級）。 有182人受伤。 震度. Investigators from over 20 universities, several consulting companies, plus researchers at various State and Federal government agencies contribute to research programs. The 1898 M6. By. 6550 Yount Street Yountville, CA 94599 Phone: 707-944-8851. 0 Yountville earthquake has been identified as a directivity record, it is likely that this is a “far-field” pulse which has been dispersed (and thus lengthened) given the relatively small size of the event (M W 5. The epicenter of the 2000 ML 5. 7 (M w), blind thrust earthquake that occurred on January 17, 1994, at 4:30:55 a. Geology and Seismology at Humboldt State University-- Earthquake information for California's North Coast; Recent Earthquakes Affecting Humboldt CountyThe epicenter of the 2000 ML 5. It had a moment magnitude of 6. The first figure below is a map, the second is a cross-section. The City of Napa in California had chimneys damaged from the 2000 Yountville (M5. USGS: Sunday's Quake Was Largest to Impact Bay Area Since 1989 - San Rafael, CA - The agency has dubbed the incident the "South Napa Earthquake. The 1943 Skwentna earthquake struck at 14:32 UTC on November 3. 1 Fire Station Area This area has many classic U. #EARTHQUAKE. 2023-01-26 04:20:14 UTC UTC time: Thursday, January 26, 2023 04:20 AM Your time: 2023. 1 earthquake. 1994 Northridge earthquake. Figures 3 and 4 show examples of chimneys covered in the study. "Download scientific diagram | Instrumental Intensity ShakeMap for the magnitude 5. 0 . Recent studies to assess very long-term seismic hazard in the USA and in Europe have highlighted the importance of the upper tail of the ground-motion distribution at the very low annual frequencies of exceedance required by these projects. 8) and the 1969 Santa Rosa Earthquake sequence (M5. 5 miles west of Yountville, 7 miles northwest of Napa, and 17 miles east of Santa Rosa at a focal depth of approximately 6 miles. On September 3, 2000 a real earthquake demonstration was held in the Napa Valley, but no stacks of barrels collapsed. from publication: The 2014 South Napa Earthquake and its relevance for New Zealand | The South Napa earthquake occurred on Sunday, 24 August. Yountville (3. 0 in or near Yountville, California, USA (updated 40 seconds ago) Past 24 hours. 2 Yountville earthquake was located 5 km west of the surface trace of the West Napa fault, as defined by Helley and Herd (1977). The September 3, 2000 Yountville Earthquake. NAPA (CBS SF) -- A magnitude 4. Despite a quick response from San. 9 nm: E: Lincoln Theater (Yountville, California) 3. Jim Luetgert. We correct. Following the Napa Earthquake of 2014, the building was purchased and restored by the grapegrower BECKSTOFFER FAMILY. imported from Wikimedia project. 7, respectively, struck the city of Santa Rosa, California, killing one person and damaging buildings. The Yountville earthquake that struck in 2000 was a magnitude 5. 8 on the moment magnitude scale and the maximum felt intensity was VII on the Mercalli intensity scale. 1 at depth of 10. S. 4 km depth; Interactive Map. Geological Survey (USGS), the California. 5 miles west of Yountville, 7 miles northwest. Browse Getty Images' premium collection of high-quality, authentic 2000 Yountville Earthquake stock photos, royalty-free images, and pictures. Pacific Standard Time. 3 Mare Island earthquake occurred in the vicinity of yesterday’s earthquake. A violent earthquake shook the Napa Valley for several long,. 4, 2000 12 AM PT. 2 Damage. 2022 Ferndale earthquake [35] Two-percent probability of exceedance in 50 years map of peak ground acceleration from the United States Geological Survey, released July 17, 2014. 26 earthquakes in the past 7 days. Yountville/Napa Earthquake, and aftershocks [1] Calculated at 5% DampingThe 1980 Eureka earthquake (also known as the Gorda Basin earthquake) occurred on November 8 at 02:27:34 local time along the northern coastal area of California in the United States. "USGS: Sunday's Quake Was Largest to Impact Bay Area Since 1989 - Saratoga, CA - The agency has dubbed the incident the "South Napa Earthquake. 6. Recent earthquakes have shown that wine barrel stacks are highly susceptible to collapse, leading to large economic losses, downtime, and longer recovery periods. 7 magnitude earthquake hit Salt Lake City, Utah, United States, with an epicenter 6 km (3. 7 earthquake struck Sumatra, on June 4 at a depth of 33. Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Help; Learn to edit; Community portal; Recent changes; Upload fileYountville has had: (M1. 3 on the moment magnitude scale. This anniversary of the event is a time to look back at what the U. YOUNTVILLE, Calif. 3 languages. These maps help to identify areas where a quake’s impact is greatest and are used by emergency managers to speed disaster response. 3, 2000, earthquake in Napa. The 1872 Owens Valley earthquake – also known as the Lone Pine earthquake – struck on March 26 at 02:30 local time in the Owens Valley (California, along the east side of the Sierra Nevada), with the epicenter near the town of Lone Pine. Gravity data indicate an ∼2-km-deep basin centered on the town of Napa, where damage was concentrated during the Yountville earthquake. Yountville/Napa Earthquake, and aftershocks [1] Calculated at 5% DampingQuakes Near Northern California Now, Today, and Recently. 1 earthquake jolted the Napa Valley on Thursday night, offering a brief reminder of last summer's 6. 7, struck Santa Rosa about 80 minutes apart. The 1999 Hector Mine earthquake occurred in Southern California, United States, on October 16 at 02:46:50 PDT. Source NotesBrief Report on the September 3, 2000 Yountville/Napa California Earthquake Report prepared for the Pacific Earthquake Engineering Center Miranda, E. 0) and 2014 South Napa (M6. Pollitz and Jon P. The City of Napa in California chimneys damaged had from the 2000 Yountville (M5. 1994 Northridge earthquake. 2). 2007 Alum Rock earthquake. 2 ML earthquake occurred on September 3, 2000 at 01:36 am (PDT) in Northern California, approximately 12 km (7 mi) NW of Napa, 5km (3 mi) WSW of Yountville, and 27 km (17. 0 and causing significant damage to unreinforced masonry (URM) buildings in the City of Napa and generating strong ground shaking in a region well known for its wine production. 0 to be felt in the Calistoga area since 1906. June 1989. 7 million. sales manager at Napa Cellars in Yountville,. m. earthquake. Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Help; Learn to edit; Community portal; Recent changes; Upload filethan the maximum considered earthquake response (MCER) spectrum for the period range from 0. 4 km depth; Interactive Map. 1) that occurred within the greater San Francisco Bay Area, having well-constrained source parameters and broadband recordings with high signal-to-noise ratios. 9 and a maximum Mercalli intensity of VI (Strong). At the nearby city of Napa, ground motion was also unexpectedly high during the 2000 Yountville earthquake (M5. 7, struck Santa Rosa about 80 minutes apart. 6 and 5. The 1932 Eureka earthquake killed one person when a chimney fell on them, and the Landers & Big Bear quakes of 1992 caused a chimney to fall on and kill a child. It was reported that during the 2000 Yountville earthquake, numerous windows on the front elevation were broken. , Miranda, E. Berkeley; Earthquakes on California's North Coast. One-Story Retail Building, Clay Street (Building Z6) Structural System, Height, Year Built: The store is a one-story, precast tilt-up concrete shear wall building with a flexible roof diaphragm constructed in 1973. 0 to be felt in the Calistoga area since 1906. 2015. 0 Yountville earthquake that struck in 2000. Almost a third of the town's population lives at the Veterans Home of California. Text is available under the Creative Commons Attribution-ShareAlike. On the basis of the re-examination. USGS: Sunday's Quake Was Largest to Impact Bay Area Since 1989 - Pacifica, CA - The agency has dubbed the incident the "South Napa Earthquake. 6 and M5. 0 6/19/06 A D V A N C E D N A T I O N A L S E I S M I C S Y S T E M ShakeMap® Manual TECHNICAL MANUAL, USERS GUIDE, AND SOFTWARE GUIDE Prepared by David J. 0 Yountville earthquake was the most recent prior damaging earthquake on the WNFZ. near Yountville, Napa. . USGS: Sunday's Quake Was Largest to Impact Bay Area Since 1989 - Martinez, CA - The agency has dubbed the incident the "South Napa Earthquake. The 2000 Yountville earthquake occurred with a moment magnitude of 5 on a previously unmapped fault, about 3 miles (4. It occurred in the broad zone of deformation that accommodates the relative motion of the North American and Pacific Plates. YOUNTVILLE, Calif. June 2000. 2000-09-05 04:00:00 PDT NAPA-- The scope of Sunday's 5. [2] Earthquake Red dots indicdate seismicity from Sept. on Earthquake Engineering. 6 and M5. TIMES STAFF WRITERS. It had a magnitude of 5. 5 mi). 2 earthquake occurred at 1:36 AM on September 3, 2000 in the mountains 10 miles northwest of the town of Napa, near Yountville, CA. Near the end of the period, daily, monthly, and even all-time record high temperatures were broken, with highs commonly peaking well over 100 °F (38 °C). By David Perlman. This magnitude-5. The September 3, 2000 Yountville Earthquake-- Summary from USGS; The September 3, 2000 Yountville Earthquake-- Info & Links from U. Yountville/Napa Earthquake, and aftershocks [1] Calculated at 5% DampingThe 2000 M L 5. 2000 Yountville earthquake. By David Perlman. PST south of downtown Los Angeles. 2006). It occurred at 01:36 PDT on September 3. These instruments are necessary because an ordinary continuous-recording seismograph may go off the. Its southern part, near Vallejo, is known to be active. 2-magnitude earthquake hit. The last significant earthquake on the West Napa Fault was the M5. 6’N; 122°24. 0 references. 8/2/2019 Broadband Waveform Modeling of Moderate Earthquakes in the San Francisco Bay Area and Preliminary Assessmen 1/20Broadband Waveform Modeling of Moderate Earthquakes…The Pacific Earthquake Engineering Research Center (PEER) is a multi-institutional research and education center with headquarters at the University of California, Berkeley. ” In Proc. 5 nm) Agua Caliente (4. 2000 Yountville earthquake. In particular, the use of an unbounded lognormal distribution to represent the aleatory variability of ground motions leads to very high and potentially. Located in the North Bay region of the Bay Area, the population was 3,436 at the 2020 census. The event was one in a series. 1 earthquake struck in the San Francisco Bay Area on Tuesday morning, according to the USGS. state of California was documented in 1769 by the Spanish explorers and Catholic missionaries of the Portolá expedition as they traveled northward from San Diego along the. (Public domain. D, density in. Its southern part, near Vallejo, is known to be active. S. Past 7 days. 0 earthquake occurred early in the morning on August 24, 2014, on the West Napa Fault. 6 ( Moore et al. 5 km onto model. 377 N, 122. The epicenter of the 2000 ML 5. 2 Yountville (Napa) earthquake. 4 M w, and a maximum Mercalli intensity of VIII (Severe). 2). , 2006). USGS: Sunday's Quake Was Largest to Impact Bay Area Since 1989 - Foster City, CA - The agency has dubbed the incident the "South Napa Earthquake. The 2000 M5. 7 km and the epicenter located approximately 7. By 1980 it is clear that according to the model, much of the SFBR region had emerged from the stress shadow, and the. The 2000 Yountville earthquake occurred with a moment magnitude of 5 on a previously unmapped fault, about 3 miles south southwest of Yountville, California in the Mayacamas Mountain Range under Mount Veeder and about 9 miles south northwest of Napa, California. With a moment magnitude of 7. "California. Current News Release - 5 September 2000 Quick Report on Strong Motion Data from the M5. 38°22'44"N, 122°24'47"W. On the basis of the re-examination of geologic data and the analysis of potential field data, the earthquake occurred on a strand of the West Napa fault, the main basin-bounding fault. 1 quake hit just before 8 p. "USGS Update on the Magnitude 6 South Napa Earthquake of August 24, 2014USGS: Sunday's Quake Was Largest to Impact Bay Area Since 1989 - Davis, CA - The agency has dubbed the incident the "South Napa Earthquake. 0 South Napa earthquake and its aftershocks were influenced by complex structure among the West Napa-Carneros-Pinole-Franklin faults system. Estimated per capita income in 2021: $58,297 (it was $30,721 in 2000) Yountville town income, earnings, and wages data Estimated median house or condo value in 2021: $787,650 (it was $209,300 in 2000). 1 earthquake jolted the Napa Valley on Thursday night, offering a brief reminder of last summer's 6. The Calaveras. 0 earthquake, the largest in the San Francisco Bay Area in over 25 years, and the first. We show for the 3 September 2000 Yountville earthquake that reported source parameters accurately predict. rank. 0 Yountville earthquake occurred on the West Napa Fault and also damaged Napa. The only other large historic event in the area is the Mare Island earthquake sequence from 1886 to 1900. This technique is based on coupled traveling wave scat. "high seas season 4 nicholas HomeUSGS: Sunday's Quake Was Largest to Impact Bay Area Since 1989 - Campbell, CA - The agency has dubbed the incident the "South Napa Earthquake. It measured 6. Back in 2000, a magnitude 5. build on its reputation for research and teaching excellence. September 3, 2000, magnitude 5. The epicenter of the 2000 ML 5. 0 South Napa earthquake, which occurred at 10:20 UTC 24 August 2014 was the largest earthquake to strike the greater San Francisco Bay area since the Mw 6. Established in 1973 by Moët et Chandon, by businessman John Wright and was the first French-owned sparkling wine producer in. 0 earthquake struck in the Yountville (Napa) area in the middle of the night on September 3, 2000. Although quakes cannot be prevented, the damage they do can be greatly reduced through prudent planning and The September 3, 2000 Yountville Earthquake A magnitude (M) 5. * Editor's note: This is the first of a two-part series looking back at the Sept. 5 g. 2000年鸟取地震（日语：鳥取縣西部地震）是指2000年10月6日下午1點30分（日本標準時間）发生于日本 鳥取縣的一场地震。 该次地震震中位于鳥取縣西部，震级为Mj 7. 8 m (2 ft 7 in) was estimated. It caused one death and more than 40 injuries, including the critical injury of a young boy who was hurt by falling. m. 2010 Baja California earthquake. 0 earthquake on the same fault had damaged the city of Napa in 2000. PDT. 0) was seismically renovated and performed wellA partial retrofit of the building was completed in 1975 and a more comprehensive one in 2004, following damage sustained in the 2000 Yountville earthquake. There are still some frayed nerves in Napa County following a quake Thursday night centered near Yountville. 2000 magnitude 5. 2008 Chino Hills earthquake. 2 Yountville earthquake was located 5 km west of the surface trace of the West Napa fault, as defined by Helley and Herd (1977). 2000-09-03 08:36:30 UTC 5. m. 6 nm) Fetters Hot Springs (4. 0 South Napa earthquake, which occurred at 10:20 UTC 24 August 2014 was the largest earthquake to strike the. 2000_Yountville_earthquake; dbr:2001_Nisqually_earthquake;. The epicenter for the 2000 Yountville earthquake which occurred on September 3, 2000 is also near the West Napa Fault. 2000 Strength reduction factors for multi-degree-of-freedom systems Santa-Ana, P. 1 earthquake occurs on the Hayward fault, we expect over 150,000 housing units to be made uninhabitable, over 350,000 people to be forced from their homes, and over 110,000 people to require public shelter. 0 Yountville earthquake two decades ago, 2,000 houses required chimney repair. ,. 1 earthquake occurred 10 miles (16 km) northwest of Napa, near Yountville, on a previously unknown fault. The magnitude 6. 7 and a maximum Mercalli intensity of IX ( Violent ). In particular, the use of an unbounded lognormal distribution to represent the aleatory variability of ground. 1 nm) Fetters Hot Springs (4. 0 magnitude and above . A magnitude 5. Yountville has had: (M1. earthquakes ranges from 5. Pacific Standard Time. 2 nm: NE: Dominus Estate: 3. Toggle the table of contents. 9 earthquake near Yountville is shown as a white star, and the South Napa earthquake is shown as a yellow star. 2 nm). Sep 4, 2000. and the epicenter was six miles east of Yountville. 3/9/2000 5 Yountville Coastal No Complete ----- 2/28/2001 . Recent earthquakes have shown that wine barrel stacks are highly susceptible to collapse, leading to large economic losses, downtime, and longer recovery periods. "Introduction Portal:San Francisco Bay Area/Did you know/62 Portal:San Francisco Bay Area/Did you know/62 •?The 2000 M5. 1 reference. 0 Yountville earthquake ruptured in the Mayacamas Mountains, to the west of the WNF, between it and the Rodgers Creek fault (RCF). Yountville is located within Napa Valley, in the North Bay region of the San Francisco Bay Area of Northern California. 6’N; 122°24. 6 nm) Mission Highlands (4. The 1898 M6. Earthquake Reconnaissance Report – 2000 Yountville Earthquake: Implications for the California Wine Industry, Simpson Gumpertz & Heger, Inc. 2 to 2. 0 Yountville Earthquake of 2000. The 2000 Yountville earthquake occurred with a moment magnitude of 5 on a previously unmapped fault, about 3 miles (4. ,. belum rainforest information / 10 sentences about leave / 2000 yountville earthquake. Design and construct all new buildings to be earthquake resistant. 1,103 earthquakes in the past 365 days. 3rd M 5. Peak Ground Acceleration (PGA) is equal to the maximum ground acceleration that occurred during earthquake shaking at a location. USGS: Sunday's Quake Was Largest to Impact Bay Area Since 1989 - Rohnert Park-Cotati, CA - The agency has dubbed the incident the "South Napa Earthquake. 10 km depth Yountville, California, United States. John A. It occurred at 01:36. At the nearby city of Napa, ground motion was also unexpectedly high during the 2000 Yountville earthquake (M5. m. The Calaveras Fault is a major branch of the San Andreas Fault System that is located in northern California in the San Francisco Bay Area. ClimateThe 1952 Kern County earthquake occurred on July 21 in the southern San Joaquin Valley and measured 7. 8’W) was about 2. It most likely played a minor role in enhancing shaking during this event but may lead to enhanced shaking caused by wave trapping during a larger-magnitude earthquake. The 1940 El Centro earthquake (or 1940 Imperial Valley earthquake) occurred at 21:35 Pacific Standard Time on May 18 (05:35 UTC on May 19) in the Imperial Valley in southeastern Southern California near the international border of the United States and Mexico. A significant historical year. 8’W) was about 2. The epicenter (38°22. 4 and a maximum Mercalli intensity of VIII (Severe), this earthquake left one person dead from a falling chimney and several injured. Each of these earthquakes, the M4. S. Past 7 days. 3 Mare Island earthquake occurred in the vicinity of yesterday’s earthquake. SMIP02 Seminar Proceedings. [3] The two earthquakes were the first major seismic activity in Iceland for 88 years. This left-lateral strike-slip earthquake occurred west of the San Andreas Fault System and injured thirty people, with total losses of $12. 414 W, 9. Worden, Vincent Quitoriano, and Kris L. South Napa California Earthquake School Performance –Napa Valley Unified School District 31 sites, typically 1 or 2-story wood frame or reinforced masonry Little to no structural damage 1920s high school damaged (and closed) due to the 2000 Yountville earthquake (M5. Correlation of Late Cretaceous and Paleogene strata west of Napa with similar strata in the Cordelia area ( Fig. Santa Rosa, California sustained unexpectedly high damage from the 1906 San Francisco earthquake (M7. André Tchelistcheff; Alfred L. 3 1898 Mare Island earthquake not well located, butMain page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Help; Learn to edit; Community portal; Recent changes; Upload fileAbstract The epicenter of the 2000 M L 5. Geology portal;The Napa Earthquake, California (M=6; 24/08/2014) Post-seismic survey report, with special focus on surface faulting RT/PRP-DGE/2015-00018 Pôle radioprotection, environnement, déchetsShakeMap Manual Version 1. Nisqually . 0 references. It is the deadliest earthquake in 2000. 2 mainshock. Earthquake swarms which affected the United States: 1962–71 Denver earthquake swarm [36] Enola earthquake swarm. A. Santiago, Chile: International Association for Earthquake Engineering. As expected, the. The epicenter (38°22. According to the United States Geological Survey, the strongest of the succession shocks occurred at 2008 hours GMT on 4 May, or 4. The 1992 Cape Mendocino earthquakes (or 1992 Petrolia earthquakes) occurred along the Lost Coast of Northern California on April 25 and 26. A smaller magnitude 5. Future seismic Sept. 1 nm: NE: Harlan Estate: 2. It caused one death and more than 40 injuries, including the critical injury of a young boy who was hurt by falling. Geological Survey, Menlo Park, California, USAUSGS National-Strong Motion Program: Corrected Peak Ground Acceleration and Velocity Values for: September 3, 2000, Yountville, CA Earthquake (posted 9/05/2000; updated 01/25/2011) Mw 5. 0 South Napa earthquake that occurred on 24 August 2014, strongly shook the City of Napa, damaging residential and commercial buildings from Brown’s Valley through the historic downtown. The 2000 Yountville earthquake occurred with a moment magnitude of 5 on a previously unmapped fault, about south southwest of Yountville, California in the Mayacamas Mountain Range under Mount Veeder and about south northwest of. An example of a ShakeMap, this one for the 03 September 2000, Yountville, Cal i-fornia, magnitude 5. Its southern part, near Vallejo, is known to be active. 0, ML 5. 414 W, 9. These three events are the only earthquakes with magnitude greater than 5. 2 earthquake, σ f increased more than surrounding areas owing to the off-fault effect of the slip peak of the 1906 earthquake near Tomales Bay . "We show for the 3 September 2000 Yountville earthquake that reported source parameters accurately predict waveforms at two close strong-motion stations (approximately 10 km from the epicenter). 9 Yountville earthquake of 2000, could have been used to identify the western portion of the West Napa fault zone as seismogenic before the South The Sept.