Seismic hazards in Thailand: a compilation and updated probabilistic analysis

Abstract

A probabilistic seismic hazard analysis (PSHA) for Thailand was performed and compared to those of previous works. This PSHA was based upon (1) the most up-to-date paleoseismological data (slip rates), (2) the seismic source zones, (3) the seismicity parameters (a and b values), and (4) the strong ground-motion attenuation models suggested as being suitable models for Thailand. For the PSHA mapping, both the ground shaking and probability of exceedance (POE) were analyzed and mapped using various methods of presentation. In addition, site-specific PSHAs were demonstrated for ten major provinces within Thailand. For instance, a 2 and 10 % POE in the next 50 years of a 0.1-0.4 g and 0.1-0.2 g ground shaking, respectively, was found for western Thailand, defining this area as the most earthquake-prone region evaluated in Thailand. In a comparison between the ten selected specific provinces within Thailand, the Kanchanaburi and Tak provinces had comparatively high seismic hazards, and therefore, effective mitigation plans for these areas should be made. Although Bangkok was defined as being within a low seismic hazard in this PSHA, a further study of seismic wave amplification due to the soft soil beneath Bangkok is required.

Assessment of Precast Wide U Beam-Column System for Mitigation of Structural Failure From Seismic Hazard in Thailand

“…The ground motion parameters for Thailand were adopted from Ornthammarath et al (2011) [4], Warnitchai and Lisantono (1996) [15], and Pailoplee and Charusiri (2016) [16]. In this assessment, based on the study of historical seismicity data from 1912 to 2007 presented by Ornthammarath et al (2011) [4], a 7.0 Mw earthquake was taken to be a possible maximum magnitude of earthquake in Thailand.…”

“…In this assessment, based on the study of historical seismicity data from 1912 to 2007 presented by Ornthammarath et al (2011) [4], a 7.0 Mw earthquake was taken to be a possible maximum magnitude of earthquake in Thailand. A probabilistic seismic hazard (PSH) map based on 50-year return period and 2% probability of being exceeded by Pailoplee and Charusiri (2016) [16] were the basis for adoption of peak ground acceleration (PGA). Based on the study by Pailoplee and Charusiri (2016) [16], 0.50g was taken as the maximum PGA for Thailand.…”

“…A probabilistic seismic hazard (PSH) map based on 50-year return period and 2% probability of being exceeded by Pailoplee and Charusiri (2016) [16] were the basis for adoption of peak ground acceleration (PGA). Based on the study by Pailoplee and Charusiri (2016) [16], 0.50g was taken as the maximum PGA for Thailand. A summary of ground motion parameters to cover an entire area of Thailand is shown in Table 1.…”

“…The calculated parameters of displacement-based assessment are presented in Table 3. Pailoplee and Charusiri (2016) [16] (shown in Figure 9). Considering the firm soil condition, the capacity of the tested system fulfils the demand of all zones except the vicinity of Kanchanaburi (P4).…”

Electrical resistivity tomographic detection of the hidden Thakek fault, Northeast Thailand

“…The interior * E-mail: rungroj@kku.ac.th of the Khorat plateau is relatively stable tectonically with no clear geologic evidence of faults (DMR, 2012(DMR, , 2019. The region is characterized by very low seismic hazard (Pailoplee et al, 2010;Pailoplee and Charusiri, 2016), commensurate with the paucity of evidence of historic earthquake damage (TMD, 2018).…”