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| Titel |
Procedure to estimate maximum ground acceleration from macroseismic intensity rating: application to the Lima, Perú data from the October-3-1974-8.1-Mw earthquake |
| VerfasserIn |
L. Ocola |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 2nd EGU Alexander von Humboldt Conference "The role of Geophysics in Natural Disaster Prevention" ; Nr. 14 (2008-01-02), S.93-98 |
| Datensatznummer |
250012088
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| Publikation (Nr.) |
 copernicus.org/adgeo-14-93-2008.pdf |
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| Zusammenfassung |
| Post-disaster reconstruction management of urban areas requires timely
information on the ground response microzonation to strong levels of ground
shaking to minimize the rebuilt-environment vulnerability to future
earthquakes. In this paper, a procedure is proposed to quantitatively
estimate the severity of ground response in terms of peak ground
acceleration, that is computed from macroseismic rating data, soil properties
(acoustic impedance) and predominant frequency of shear waves at a site. The
basic mathematical relationships are derived from properties of wave
propagation in a homogeneous and isotropic media. We define a Macroseismic
Intensity Scale IMS as the logarithm of the quantity of seismic energy that
flows through a unit area normal to the direction of wave propagation in unit
time. The derived constants that relate the IMS scale and peak acceleration
agree well with coefficients derived from a linear regression between MSK
macroseismic rating and peak ground acceleration for historical earthquakes
recorded at a strong motion station, at IGP's former headquarters, since
1954. The procedure was applied to 3-October-1974 Lima macroseismic intensity
data at places where there was geotechnical data and predominant ground
frequency information. The observed and computed peak acceleration values, at
nearby sites, agree well. |
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