A simple algorithm for tracing synthetic isoseismals

1996 ◽  
Vol 86 (4) ◽  
pp. 1019-1027 ◽  
Author(s):  
Livio Sirovich
Keyword(s):  
Seismic Hazard ◽  
Simple Algorithm ◽  
Hazard Maps ◽  
Attenuation Relations ◽  
Seismic Hazard Maps ◽  
Earthquake Sources ◽  
Modeling Techniques ◽  
San Fernando ◽  
Synthetic Isoseismals

Abstract Probabilistic calculation of regional seismic hazard maps also requires the use of the so-called “attenuation relations,” which give the reference “shake-ability” at certain distances from the earthquake sources. This article achieves progress in this area. In fact, the present tests on a series of earthquakes in California (San Fernando, 1971; Whittier Narrows, 1987; Northridge, 1994) suggest that in some regions the areal shapes of the territories damaged by past earthquakes may be synthetically traced—sometimes amazingly well—with a simple algorithm that considers some gross features of the sources, and this is compatible with theory. It seems that this algorithm gives rather stable results. Moreover, when the detailed modeling techniques available nowadays are inapplicable due to lack of data, or for purpose of saving time and money, it might be useable for improving seismic hazard calculations and, conversely, for retrieving information about sources of earthquakes from the preinstrumental era.

Seismic hazard analysis: a comparative study

2006 ◽  
Vol 33 (9) ◽  
pp. 1156-1171 ◽  
Author(s):  
H P Hong ◽  
K Goda ◽  
A G Davenport
Keyword(s):  
Seismic Hazard ◽  
Seismic Hazard Assessment ◽  
Historical Seismicity ◽  
Hazard Maps ◽  
Uniform Hazard Spectra ◽  
Attenuation Relations ◽  
Seismic Hazard Maps ◽  
Cell Method ◽  
Thiessen Polygon ◽  
The Impact

The quantitative seismic hazard maps for the 1970s National Building Code of Canada were evaluated using the Davenport–Milne method. The Cornell–McGuire method is employed to develop recent seismic hazard maps of Canada. These methods incorporate the information on seismicity, magnitude-recurrence relations, and ground motion (or response) attenuation relations. The former preserves and depends completely on details of the historical seismicity; the latter smoothes the irregular spatial occurrence pattern of the historical seismicity into seismic source zones. Further, the Epicentral Cell method, which attempts to incorporate the preserving and smoothing aspect of these methods, has been developed. However, the impact of the adopted assumptions on the estimated quantitative seismic hazard has not been investigated. This study provides a comparative seismic hazard assessment using the above-mentioned methods and simulation-based algorithms. The analysis results show that overall the Davenport–Milne method gives quasi-circular seismic hazard contours near significant historical events, and the Cornell–McGuire method smoothes the transition of contours. The Epicentral Cell method provides estimates approximately within the former and the latter. Key words: epicentral cell method, probability, seismic hazard, Thiessen polygon, Voronoi, uniform hazard spectra.

scholarly journals Seismic hazard assessment in Eastern and Southern Africa

1999 ◽  
Vol 42 (6) ◽  
Author(s):  
V. Midzi ◽  
D. J. Hlatywayo ◽  
L. S. Chapola ◽  
F. Kebede ◽  
K. Atakan ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Hazard Assessment ◽  
Southern Africa ◽  
Probabilistic Approach ◽  
Seismic Hazard Assessment ◽  
Rift System ◽  
Hazard Maps ◽  
Attenuation Relations ◽  
Seismic Hazard Maps ◽  
Eastern And Southern Africa

Seismic hazard assessment for the Eastern and Southern Africa region was done using the probabilistic approach. Seismic hazard maps for 10% exceedance in 50 years, 10% exceedance in 100 years, as well as for 50 and 100 years return periods were prepared using the FRISK88M software. The area involved covers a wide region bounded by latitudes 40°S-25°N and longitudes 10°E and 55°E. Input parameters for the computations were obtained using the recent earthquake catalogue compiled by Turyomurugyendo. The catalogue which covers the time period 627-1994, contains earthquakes within the area bounded by 40°S-25°N and 10°E-55°E, with homogeneous magnitudes (M S ). Since a Poisson model of earthquake occurrence is assumed, dependent events were cleaned from the catalogue. Attenuation relations for the Eastern and Southern Africa region based on the strong motion data are virtually non-existent. However, attempts have been made recently by Jonathan and Twesigomwe to establish an average attenuation relation for the region. These relations were used in the computations. Possible uncertainties in the attenuation relations were accounted for using the logic-tree formalism. The results are presented in seismic hazard maps in terms of Peak Ground Acceleration (PGA) for the mean and the 85th percentile. The distribution of PGA values indicate relatively high hazard along the East African rift system. In the northern segments of the rift system, they exceed 250 gals for 10% probability of exceedence in 50 years.

Effect of Time Dependence on Probabilistic Seismic-Hazard Maps and Deaggregation for the Central Apennines, Italy

2009 ◽  
Vol 99 (2A) ◽  
pp. 585-610 ◽  
Author(s):  
A. Akinci ◽  
F. Galadini ◽  
D. Pantosti ◽  
M. Petersen ◽  
L. Malagnini ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Time Dependence ◽  
Probabilistic Seismic Hazard ◽  
Hazard Maps ◽  
Central Apennines ◽  
Seismic Hazard Maps

Seismic hazard maps for the U.K.

1997 ◽  
Vol 14 (2-3) ◽  
pp. 141-154 ◽  
Author(s):  
R. M. W. Musson ◽  
P. W. Winter
Keyword(s):  
Seismic Hazard ◽  
Hazard Maps ◽  
Seismic Hazard Maps

First USGS Urban Seismic Hazard Maps Predict the Effects of Soils

2006 ◽  
Vol 77 (1) ◽  
pp. 23-29 ◽  
Author(s):  
C. H. Cramer ◽  
J. S. Gomberg ◽  
E. S. Schweig ◽  
B. A. Waldron ◽  
K. Tucker
Keyword(s):  
Seismic Hazard ◽  
Hazard Maps ◽  
Seismic Hazard Maps

scholarly journals The Memphis, Shelby County, Tennessee, seismic hazard maps

2004 ◽  
Author(s):  
Chris H. Cramer ◽  
Joan S. Gomberg ◽  
Eugene S. Schweig ◽  
Brian A. Waldron ◽  
Kathleen Tucker
Keyword(s):  
Seismic Hazard ◽  
Hazard Maps ◽  
Seismic Hazard Maps ◽  
Shelby County

scholarly journals Assessment on earthquake resistance spectral design load criteria for buildings and infrastructures in Indonesia

2021 ◽  
Vol 331 ◽  
pp. 07009
Author(s):  
I Wayan Sengara ◽  
Fahmi Aldiamar
Keyword(s):  
Seismic Hazard ◽  
Risk Reduction ◽  
Disaster Risk Reduction ◽  
Disaster Risk ◽  
Earthquake Resistance ◽  
Hazard Maps ◽  
Seismic Codes ◽  
Seismic Hazard Maps ◽  
Design Load ◽  
Spectral Design

General assessment on earthquake resistance spectral design load criteria for buildings and infrastructures associated with the recent development of Indonesian seismic hazard maps is presented in this paper. The assessment is directed toward general identification of their associated risks for input to policy formulation of disaster risk reduction management plans or strategies. Indonesian seismic hazard maps haveevolved for the last three decades. This is originated from an early development map before 2002, where a seismic hazard map particularly for buildings (1983) was developed adopting the early process of probabilisticseismic hazard analysis (PSHA) for 200 years return period (RP). Further, a 2002 version seismic hazard maphas been developed in the form of peak ground acceleration (PGA) for 500 years RP. Spectral design criteriafor buildings and bridges have been later developed by updating PSHA involving new seismic source zones, ground-motion predictive equations, and various earthquake RP, accommodating seismic codes for buildings(2500 years RP), for bridges (1000 years RP) and dams involving various RP up to 10,000 years RP correspond to its design level. The spectral accelerations also have included PGA, short (0.2s) period, and 1-s period. The latest update hazard maps (2017) have been developed and adopted for seismic codes for buildings, bridges, dams, and other related infrastructures. The increase in spectral design load criteria is identified to assess the general risk of existing constructions, considering the results of several recent building damage surveys. Adoption of new seismic codes based on the most recent hazard maps along with its enforcement is expected to contribute to seismic disaster risk reduction in Indonesia.

Seismic hazard maps of Mexico, the Caribbean, and Central and South America

2004 ◽  
Vol 390 (1-4) ◽  
pp. 159-175 ◽  
Author(s):  
James G. Tanner ◽  
Kaye M. Shedlock
Keyword(s):  
South America ◽  
Seismic Hazard ◽  
Hazard Maps ◽  
Seismic Hazard Maps ◽  
The Caribbean
Sign in / Sign up

Export Citation Format

Share Document