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West Napa fault zone

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Journal Article
Published: 01 November 2016
Bulletin of the Seismological Society of America (2016) 106 (6): 2721–2746.
... and south of the 2014 surface rupture. The observed FZGW s indicate that the West Napa fault zone ( WNFZ ) and the Franklin fault ( FF ) are continuous in the subsurface for at least 75 km. Previously published potential‐field data indicate that the WNFZ extends northward to the Maacama fault ( MF...
Journal Article
Published: 30 July 2019
Bulletin of the Seismological Society of America (2019) 109 (5): 1907–1921.
...Yong‐Gang Li; Rufus D. Catchings; Mark R. Goldman Abstract We present evidence for multiple fault branches of the West Napa fault zone (WNFZ) based on faultzone trapped waves (FZTWs) generated by two explosions that were detonated within the main surface rupture zone produced by the 24 August 2014...
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Journal Article
Published: 27 September 2016
Bulletin of the Seismological Society of America (2016) 106 (6): 2747–2763.
...) and the southern part (A2) of the surface rupture of the West Napa fault zone ( WNFZ ). We also observed FZTW s on an array (A3) deployed across the intersection of the Franklin and Southampton faults, which appear to be the southward continuations of the WNFZ . A1, A2, and A3 consisted of 20, 20, and 10 L28 (4.5...
Image
Shaded relief map of study area. Focal mechanism shows epicenter of  M  5.2...
Published: 01 June 2006
relocated by double difference method ( Waldhauser and Ellsworth, 2000 ), green circles. Orange stars are M > 5 earthquakes since 1906. The strands of the West Napa fault zone are well expressed geologically and geomorphically between points A and B. Point E shows evidence of >147 m of dip slip
Image
Comparisons of <b>fault</b>‐<b>zone</b> guided waves evaluated using two separate methods...
Published: 21 July 2020
Figure 5. Comparisons of faultzone guided waves evaluated using two separate methods. The guided waves were recorded across the West Napa fault zone and evaluated using waveforms ( Li et al. , 2016 ) and peak ground velocities (PGVs, Catchings et al. , 2016 ) with data from the same array
Image
(a) Google Earth image with the 2014    M    6 South <b>Napa</b> earthquake (large...
Published: 30 July 2019
Figure 1. (a) Google Earth image with the 2014 M  6 South Napa earthquake (large star), and multiple surface ruptures (thick lines) along the West Napa fault zone (WNFZ), including the main (WNFm) surface rupture and two shorter ruptures to the east (WNFe1 and WNFe2). Small stars show
Journal Article
Journal: Geosphere
Published: 01 December 2015
Geosphere (2015) 11 (6): 2015–2030.
... these data can be used in geospatial analyses, including the use of solid modeling techniques common to engineering fields. The West Napa fault zone was first mapped by Weaver (1949) , and has been studied intermittently over the past several decades ( Fox et al., 1973 ; Helley and Herd, 1977...
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Journal Article
Published: 24 May 2016
Bulletin of the Seismological Society of America (2016) 106 (3): 1100–1109.
.... Although the mainshock coseismic and postseismic slip appears to have occurred on the near‐vertical, strike‐slip West Napa fault, many of the aftershocks occur in a complex zone of secondary faulting. Earthquake locations in the main aftershock zone, near the mainshock hypocenter, delineate multiple...
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Journal Article
Published: 01 June 2006
Bulletin of the Seismological Society of America (2006) 96 (3): 1192–1198.
... relocated by double difference method ( Waldhauser and Ellsworth, 2000 ), green circles. Orange stars are M > 5 earthquakes since 1906. The strands of the West Napa fault zone are well expressed geologically and geomorphically between points A and B. Point E shows evidence of >147 m of dip slip...
FIGURES | View All (4)
Journal Article
Journal: Geosphere
Published: 01 June 2011
Geosphere (2011) 7 (3): 629–657.
... across the West Napa-Carneros fault zones since ∼5 Ma. The volcanic fields in the California Coast Ranges north of San Francisco Bay are temporally and spatially associated with the northward migration of the Mendocino triple junction and the transition from subduction and associated arc volcanism...
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Series: GSA Special Papers
Published: 01 January 1984
DOI: 10.1130/SPE198-p103
... The basal Great Valley sequence in Napa and southern Lake Counties, California, is a mappable chaotic unit composed largely of ophiolitic debris. Serpentinite flows and breccias, mafic breccias and associated finer-grained clastic rocks, and blocks of extrusive greenstone, mafic breccia, chert...
Journal Article
Published: 25 February 2015
Seismological Research Letters (2015) 86 (2A): 309–326.
... between the Pacific and North American tectonic plates ( Jennings, 1994 ; Fig.  1 ). The West Napa fault system is a relatively minor strike‐slip fault in the Contra Costa shear zone, which transfers slip between the Northern Calaveras, West Napa, and Concord faults ( Unruh and Kelson, 2002a , b ; Kelson...
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Journal Article
Published: 01 March 2015
Seismological Research Letters (2015) 86 (2A): 335–343.
... U. Werner C. ( 1997 ). GAMMA SAR processor and interferometry software , in 3rd ERS Symposium on Space at the Service of our Environment , Florence, Italy , 17–21 March 1997 . Wesling J. R. Hanson K. L. ( 2008 ). Mapping of the West Napa fault zone for input...
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Journal Article
Published: 27 May 2015
Seismological Research Letters (2015) 86 (4): 1119–1127.
... key features of the surface rupture important for both scientific and emergency response. We produced a credible estimate of the length of the surface rupture based on field observations, identified a section of the west Napa fault zone as the location of principal rupture, and compiled a preliminary...
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Journal Article
Published: 23 March 2016
Seismological Research Letters (2016) 87 (3): 609–619.
... the 24 August 2014 M  6.0 mainshock (10:20 UTC), the general extent of the surface ruptures within the broad West Napa fault zone (Fig.  1 ) was understood within the first 24 hrs ( Dawson et al. , 2014 ; Brocher et al. , 2015 ; Morelan et al. , 2015 ). By the early morning of 25 August 2014...
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Journal Article
Published: 01 March 2015
Seismological Research Letters (2015) 86 (2A): 361–368.
... >100/km 2 . The largest concentration of tags is located in central Napa. The distribution of red and yellow tags does not appear to depend on the distance to the fault. Although there are many tags near the fault traces in Brown’s Valley, there are few tags on the west side of Napa Valley...
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Journal Article
Journal: Geosphere
Published: 01 October 2010
Geosphere (2010) 6 (5): 594–620.
... faults that involves 3.2–3.4 Ma Sonoma Volcanics, is bluntly truncated by or abuts the Maacama fault zone. However, no obvious offset equivalents of the magnetic or gravity gradients that mark the West Napa fault northeast of the Maacama fault zone are present on the southwest side of the Maacama fault...
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Journal Article
Published: 01 March 2015
Seismological Research Letters (2015) 86 (2A): 355–360.
.... Although the alignment of positive residuals on these fault strands suggest the possibility of either a guided wave and connectivity of the West Napa–Franklin–Calaveras faults, or otherwise trapped waves in these fault zones, our simple observations cannot distinguish between guided and trapped waves...
FIGURES
Journal Article
Published: 07 October 2015
Seismological Research Letters (2015) 86 (6): 1593–1602.
... [EERI], 2014 ; Brocher et al. , 2015 ) and seismic and geodetic source inversions ( Barnhart et al. , 2015 ; Dreger et al. , 2015 ; Wei et al. , 2015 ) indicate that a 15-km-long northwest-trending section of the West Napa Valley fault ruptured in the earthquake. Remarkably, it was the first...
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Journal Article
Journal: Geosphere
Published: 01 June 2011
Geosphere (2011) 7 (3): 658–683.
...), and West Napa (≥30 km) faults are presented in the following. New interpretations for the Tolay fault zone, the Bennett Valley fault, and numerous thrust faults ( Youngman, 1989 ; Randolph-Loar, 2002 ) are also presented. The Burdell Mountain Volcanics include flow-banded porphyritic andesite...
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