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| Titel |
Use of historical earthquake records for seismic hazard assessment of regions with low b values |
| VerfasserIn |
Tae-Kyung Hong, Soung Eil Houng, Seong Jun Park |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250075776
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| Zusammenfassung |
| The Gutenberg-Richter b value and maximum magnitude
(Mmax) are important parameters for calculation of
potential seismic hazards. The global instrumental
observation of seismic events began in early 1900s, which
may be too short to account for seismicity with
recurrence intervals of hundreds or thousands years. This
is particularly true in intraplate regions where strain
accumulation rates are low. Historical earthquake records
may be useful to complement the instrument seismicity
records. Historical records are based on the description
of seismic damages with inherent uncertainty in actual
epicenters and magnitudes. We propose a method based on
probabilistic analysis to determine the epicenters of
historical events considering the current instrumental
seismicity with an idea that the spatial distribution of
earthquakes is consistent with time as long as the
tectonic environment remains invariant. The locations of
historical epicenters are determined probabilistically
considering the most damaged locations and the
instrumental seismicity. The magnitudes of historical
events are calculated by a magnitude-intensity
relationship. We apply the method to Korean historical
records that are composed of 2185 historical earthquake
records during 2-1904. The b value of the historical
events is found to be 0.73. The maximum magnitude based
on historical earthquakes is estimated to be about 7.5,
which is much greater than the observed maximum magnitude
of instrumental seismicity (5.3). This approach may be
useful for seismic hazard analysis for events with long
recurrence intervals. |
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