Near-fault Ground Motion Estimates Including Directivity Effects from Large Strike-slip Earthquakes in the San Francisco Bay Area PDF Download
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Author: Paul G. Somerville
Publisher:
ISBN:
Category : Earthquakes
Languages : en
Pages : 382
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Book Description
Author: Paul G. Somerville
Publisher:
ISBN:
Category : Earthquakes
Languages : en
Pages : 382
Get Book Here
Book Description
Author: Paul G. Somerville
Publisher:
ISBN:
Category : Earthquakes
Languages : en
Pages :
Get Book Here
Book Description
Author: Paul G. Somerville
Publisher:
ISBN:
Category : Earthquakes
Languages : en
Pages : 130
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Book Description
Author:
Publisher:
ISBN:
Category : Earthquake hazard analysis
Languages : en
Pages : 564
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Author:
Publisher:
ISBN:
Category : Geological surveys
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Earthquake hazard analysis
Languages : en
Pages : 472
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Book Description
Author: Association of Bay Area Governments
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 60
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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Book Description
We estimate the ground motions produced by the 1906 San Francisco earthquake making use of the recently developed Song et al. (2008) source model that combines the available geodetic and seismic observations and recently constructed 3D geologic and seismic velocity models. Our estimates of the ground motions for the 1906 earthquake are consistent across five ground-motion modeling groups employing different wave propagation codes and simulation domains. The simulations successfully reproduce the main features of the Boatwright and Bundock (2005) ShakeMap, but tend to over predict the intensity of shaking by 0.1-0.5 modified Mercalli intensity (MMI) units. Velocity waveforms at sites throughout the San Francisco Bay Area exhibit characteristics consistent with rupture directivity, local geologic conditions (e.g., sedimentary basins), and the large size of the event (e.g., durations of strong shaking lasting tens of seconds). We also compute ground motions for seven hypothetical scenarios rupturing the same extent of the northern San Andreas fault, considering three additional hypocenters and an additional, random distribution of slip. Rupture directivity exerts the strongest influence on the variations in shaking, although sedimentary basins do consistently contribute to the response in some locations, such as Santa Rosa, Livermore, and San Jose. These scenarios suggest that future large earthquakes on the northern San Andreas fault may subject the current San Francisco Bay urban area to stronger shaking than a repeat of the 1906 earthquake. Ruptures propagating southward towards San Francisco appear to expose more of the urban area to a given intensity level than do ruptures propagating northward.
Author:
Publisher:
ISBN:
Category : Natural disasters
Languages : en
Pages : 106
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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Book Description
We compute ground motions in the San Francisco Bay area for 35 Mw 6.7-7.2 scenario earthquake ruptures involving the Hayward fault. The modeled scenarios vary in rupture length, hypocenter, slip distribution, rupture speed, and rise time. This collaborative effort involves five modeling groups, using different wave propagation codes and domains of various sizes and resolutions, computing long-period (T> 1-2 s) or broadband (T> 0.1 s) synthetic ground motions for overlapping subsets of the suite of scenarios. The simulations incorporate 3-D geologic structure and illustrate the dramatic increase in intensity of shaking for Mw 7.05 ruptures of the entire Hayward fault compared with Mw 6.76 ruptures of the southern two-thirds of the fault. The area subjected to shaking stronger than MMI VII increases from about 10% of the San Francisco Bay urban area in the Mw 6.76 events to more than 40% of the urban area for the Mw 7.05 events. Similarly, combined rupture of the Hayward and Rodgers Creek faults in a Mw 7.2 event extends shaking stronger than MMI VII to nearly 50% of the urban area. For a given rupture length, the synthetic ground motions exhibit the greatest sensitivity to the slip distribution and location inside or near the edge of sedimentary basins. The hypocenter also exerts a strong influence on the amplitude of the shaking due to rupture directivity. The synthetic waveforms exhibit a weaker sensitivity to the rupture speed and are relatively insensitive to the rise time. The ground motions from the simulations are generally consistent with Next Generation Attenuation ground-motion prediction models but contain long-period effects, such as rupture directivity and amplification in shallow sedimentary basins that are not fully captured by the ground-motion prediction models.
