Publication Date:
2017-04-04
Description:
macroseismic
intensity data. A set of 2373 intensity observations from 15 earthquakes is analysed
to calibrate non-parametric models for the source and attenuation with distance, the distance
being computed from the instrumental epicentres located according to the International
Seismological Centre (ISC) catalogue. In a second step, the non-parametric source model
is regressed against different magnitude values (e.g. MLH, mb, MS, Mw) as listed in various
instrumental catalogues. The reliability of the calibrated model is then assessed by applying
the methodology to macroseismic intensity data from 29 validation earthquakes for which
bothMLH and mb are available from the Central Asian Seismic Risk Initiative (CASRI) project
and the ISC catalogue. An overall agreement is found for both the location and magnitude of
these events, with the distribution of the differences between instrumental and intensity-based
magnitudes having almost a zero mean, and standard deviations equal to 0.30 and 0.44 for
mb and MLH, respectively. The largest discrepancies are observed for the location of the 1985,
MLH = 7.0 southern Xinjiang earthquake, whose location is outside the area covered by the
intensity assignments, and for the magnitude of the 1974, mb = 6.2 Markansu earthquake,
which shows a difference in magnitude greater than one unit in terms of MLH. Finally, the
relationships calibrated for the non-parametric source model are applied to assign different
magnitude-scale values to earthquakes that lack instrumental information. In particular, an
intensity-based moment magnitude is assigned to all of the validation earthquakes.
Description:
Published
Description:
710-724
Description:
5.1. TTC - Banche dati e metodi macrosismici
Description:
JCR Journal
Description:
restricted
Keywords:
seismicity and tectonics: seismic attenuarion; Asia
;
04. Solid Earth::04.06. Seismology::04.06.05. Historical seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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