Deaggregation is one of the products of probabilistic seismic hazard analysis (PSHA) suitable for identifying the relative contributions of various magnitude-distance bins to a hazard or intensity measure (IM) level. In this paper, we elucidate some interesting features of deaggregations, such as: their monotonically decreasing nature with IM; their invariance to any minimum IM level; and the pertinence of their bins to a complementary cumulative distribution function (CCDF). We use these features of hazard deaggregation along with copula functions in a simplified method for computing vector deaggregation and vector hazard given the scalar counterparts. We validate our simplified procedure at a hypothetical site surrounded by multiple fault sources where seismic hazard is calculated using a logic tree. We also demonstrate the application of our approach to a real site in Los Angeles, CA. Finally, we explore whether the invariance property of deaggregations can be used to compute scalar hazard curves using new ground motion prediction models/IMs, and find that for low to moderate levels of IM, a reasonable approximation is obtained.
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Research Article|
November 01, 2018
Computation of Vector Hazard Using Salient Features of Seismic Hazard Deaggregation
Somayajulu L. N. Dhulipala, S. M. EERI;
a)
Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VAEmail: lakshd5@vt.edu
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Adrian Rodriguez-Marek, M. EERI;
Adrian Rodriguez-Marek, M. EERI
a)
Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA
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Madeleine M. Flint, M. EERI
Madeleine M. Flint, M. EERI
a)
Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA
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Earthquake Spectra (2018) 34 (4): 1893–1912.
Article history
received:
01 Aug 2017
accepted:
22 May 2018
first online:
09 Jun 2020
Citation
Somayajulu L. N. Dhulipala, Adrian Rodriguez-Marek, Madeleine M. Flint; Computation of Vector Hazard Using Salient Features of Seismic Hazard Deaggregation. Earthquake Spectra 2018;; 34 (4): 1893–1912. doi: https://doi.org/10.1193/080117EQS149M
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Index Terms/Descriptors
- acceleration
- body waves
- buildings
- California
- earthquakes
- elastic waves
- engineering properties
- faults
- geologic hazards
- ground motion
- Los Angeles California
- Los Angeles County California
- natural hazards
- normal faults
- numerical models
- peak ground acceleration
- prediction
- probability
- reverse faults
- S-waves
- seismic intensity
- seismic waves
- simulation
- spectra
- statistical analysis
- United States
- velocity
- Puente Hills Fault
Latitude & Longitude
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