Data di Pubblicazione:
2011
Abstract:
A set of probabilistic seismic hazard maps for Thailand has been derived using
procedures developed for the latest US National Seismic Hazard Maps. In contrast to earlier
hazard maps for this region, which are mostly computed using seismic source zone delineations,
the presented maps are based on the combination of smoothed gridded seismicity,
crustal-fault, and subduction source models. Thailand’s composite earthquake catalogue is
revisited and expanded, covering a study area limited by 0◦–30◦N Latitude and 88◦–110◦E
Longitude and the instrumental period from 1912 to 2007. The long-term slip rates and estimates
of earthquake size from paleoseismological studies are incorporated through a crustal
fault source model. Furthermore, the subduction source model is used to model the megathrust
Sunda subduction zones, with variable characteristics along the strike of the faults.
Epistemic uncertainty is taken into consideration by the logic tree framework incorporating
basic quantities, such as different source modelling, maximum cut-off magnitudes and
ground motion prediction equations. The ground motion hazard map is presented over a 10
km grid in terms of peak ground acceleration and spectral acceleration at 0.2, 1.0, and 2.0
undamped natural periods and a 5% critical damping ratio for 10 and 2% probabilities of
exceedance in 50 years. The presented maps give expected ground motions that are based on
more extensive data sources than applied in the development of previous maps. The main
findings are that northern and western Thailand are subjected to the highest hazard. The
largest contributors to short- and long-period ground motion hazard in the Bangkok region
are from the nearby active faults and Sunda subduction zones, respectively.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
Seismic Hazard Map; Thailand; Bangkok
Elenco autori:
Teraphan, Ornthammarath; Pennung, Warnitchai; Kawin, Worakanchana; Saeed, Zaman; Ragnar, Sigbjörnsson; Lai, CARLO GIOVANNI
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