The Mw 6.0 24 August 2014 South Napa Earthquake

Brocher, Thomas M.; Baltay, A.; Hardebeck, Jeanne L.; Pollitz, Fred F.; Murray, J. R.; Llenos, A. L.; Schwartz, David P.; Blair, J. Luke; Ponti, Daniel J.; Lienkaemper, James J.; Langenheim, Victoria E.; Dawson, Timothy E.; Hudnut, K. W.; Shelly, D. R.; Dreger, Douglas S.; Boatwright, John; Aagaard, Brad T.; Wald, David J.; Allen, R. M.; Barnhart, William D.; Knudsen, Kathy L.; Brooks, Benjamin A.; Scharer, Katherine M.

doi:10.1785/0220150004

Cited by 76 publications

(73 citation statements)

References 41 publications

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“…One hypothesis is that hypocenters of large earthquakes could systematically be located at the edges of creeping zones, which are manifested in the finite-source slip maps as zones of low slip. Because most South Napa aftershocks are located at a deeper,7 ∼ 12 km range (Hardebeck and Shelly, 2014;Brocher et al, 2015), such observations of small-scale seismicity can be seen as the boundary between locked zones and actively creeping regions on the fault plane (Rubin et al, 1999;Schaff et al, 2002;Waldhauser and Ellsworth, 2002). The rise time for the slip deeper than 5 km is systematically shorter than that at shallower depth, which is consistent with frequently occurring smaller events.…”

Section: Discussionmentioning

confidence: 64%

“…We note the mainshock and aftershock epicenters determined by double-difference relocation (Hardebeck and Shelley, 2014;Brocher et al, 2015) lie beneath or slightly west of our fault planes (Fig. 1).…”

Section: Epicenter Relocationmentioning

confidence: 73%

“…The first report of the earthquake from the Northern California Earthquake Data Center (NCEDC) indicates a hypocentral depth of 11.0 km with longitude and latitude of (122.3105°W, 38.217°N). Surface rupture was documented by field observations and Light Detection and Ranging (LiDAR) imaging Hudnut et al, 2014;Brocher et al, 2015), with about 12 km of continuous rupture starting near the epicenter and extending to the northwest. The southern part of the rupture is relatively straight, but the strike changes by about 15°at the northern end over a 6 km segment.…”

Section: Introductionmentioning

confidence: 99%

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The 2014 Mw 6.1 South Napa Earthquake: A Unilateral Rupture with Shallow Asperity and Rapid Afterslip

Wei

Barbot

Graves

et al. 2015

Seismological Research Letters

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Section: Discussionmentioning

confidence: 64%

Section: Epicenter Relocationmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

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The 2014 Mw 6.1 South Napa Earthquake: A Unilateral Rupture with Shallow Asperity and Rapid Afterslip

Wei

Barbot

Graves

et al. 2015

Seismological Research Letters

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“…Other interpolation techniques such as the Inverse Distance Weighting (IDW) will be explored in future developments by taking into account the spatial discontinuity due to the fault system. Finally, as revealed by several studies [Barnhart et al, 2015;Brocher et al, 2015;Ji et al, 2015], the earthquake epicenter is located 1.7 Km westward of the known West Napa Fault system, and it mostly ruptured unmapped portions of this fault system. Therefore, to fully address all of the observed features, as well as to provide new insights about the slipping fault, additional investigations are required regarding, for example, the inversion of the optimized 3D co-seismic deformation field and the spatial and temporal distribution of the seismicity associated to the main shock.…”

Section: Discussionmentioning

confidence: 89%

3D displacement field retrieved by integrating Sentinel-1 InSAR and GPS data: the 2014 South Napa earthquake

Polcari

Palano

Fernández

et al. 2016

European Journal of Remote Sensing

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In this study the integration of Sentinel-1 InSAR (Interferometric Synthetic Aperture Radar) and GPS (Global Positioning System) data was performed to estimate the three components of the ground deformation field due to the Mw 6.0 earthquake occurred on August 24th, 2014, in the Napa Valley, California, USA. The SAR data were acquired by the Sentinel-1 satellite on August 7 th and 31 st respectively. In addition, the GPS observations acquired during the whole month of August were analyzed. These data were obtained from the Bay Area Regional Deformation Network, the UNAVCO and the Crustal Dynamics Data Information System online archives. The data integration was realized by using a Bayesian statistical approach searching for the optimal estimation of the three deformation components. The experimental results show large displacements caused by the earthquake characterized by a predominantly NW-SE strike-slip fault mechanism.

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“…the West Napa Fault (Figure 8) (Brocher et al 2015), which is one of a series of Coast Range faults that have slip and event rates within the aforementioned ranges. The event produced ground motions in the Delta region, but was too distant to produce damage.…”

Section: Seismic Sourcesmentioning

confidence: 99%

Factors and Processes Affecting Levee System Vulnerability

Deverel¹,

Bachand²,

Brandenberg³

et al. 2016

SFEWS

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We appraised factors and processes related to human activities and high water, subsidence, and seismicity. Farming and drainage of peat soils caused subsidence, which contributed to levee internal failures. Subsidence rates decreased with time, but still contributed to levee instability. Modeling changes in seepage and static slope instability suggests an increased probability of failure with decreasing peat thickness. Additional data is needed to assess the spatial and temporal effects of subsidence from peat thinning and deformation. Large-scale, state investment in levee upgrades (> $700 million since the mid-1970s) has increased conformance with applicable standards; however, accounts conflict about corresponding reductions in the number of failures.Modeling and history suggest that projected increases in high-flow frequency associated with climate change will increase the rate of levee failures. Quantifying this increased threat requires further research. A reappraisal of seismic threats resulted in updated ground motion estimates for multiple faults and earthquake-occurrence frequencies. Estimated ground motions are large enough to induce failure. The immediate seismic threat, liquefaction, is the sudden loss of strength from an increase in the pressure of the pore fluid and the corresponding loss of inter-particle contact forces. However, levees damaged during an earthquake that do not immediately fail may eventually breach. Key sources of uncertainty include occurrence frequencies and magnitudes, localized ground motions, and data for liquefaction potential.Estimates of the consequences of future levee failure range up to multiple billions of dollars. Analysis of future risks will benefit from improved description of levee upgrades and strength as well as consideration of subsidence, the effects of climate change, and earthquake threats. Levee habitat ecosystem benefits in this highly altered system are few. Better recognition and coordination is needed among the creation of high-value habitat, levee needs, and costs and benefits of levee improvements and breaches.

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The Mw 6.0 24 August 2014 South Napa Earthquake

Cited by 76 publications

References 41 publications

The 2014 Mw 6.1 South Napa Earthquake: A Unilateral Rupture with Shallow Asperity and Rapid Afterslip

The 2014 Mw 6.1 South Napa Earthquake: A Unilateral Rupture with Shallow Asperity and Rapid Afterslip

3D displacement field retrieved by integrating Sentinel-1 InSAR and GPS data: the 2014 South Napa earthquake

Factors and Processes Affecting Levee System Vulnerability

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