Seismicity of Peninsular Malaysia due to intraplate and far field sources

Loi, Daniel Weijie; Raghunandan, Mavinakere Eshwaraiah; Swamy, Varghese

doi:10.12989/eas.2016.10.6.1391

Cited by 2 publications

(4 citation statements)

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“…11). Although this work considered M w 5.0 as a plausible case, concerns have been raised by Looi et al (2013) in an extreme event of M w 6.0 that cannot be ruled out. Therefore, utilizing the same source but altering the maximum magnitude to M w 6.0, the PGA values for this special case were further calculated and plotted in Fig.…”

Section: Hazard Mapsmentioning

confidence: 96%

“…These two sources can further be grouped into three seismotectonic regions: Sumatran subduction zone (SSZ), Sumatran fault zone (SFZ) and intraplate zones within the Sunda Plate. Historical statistics obtained from MMD showed that states located on the western coastline of Peninsular Malaysia are more vulnerable to felt ground motions (Loi et al, 2016;Sooria, 2012). The location of Peninsular Malaysia within the Sunda Plate and its nearby seismic sources are presented in Fig.…”

Section: Tectonic Setting and Seismicity Of Peninsular Malaysiamentioning

confidence: 99%

“…Unsurprisingly, PSHA has been the choice for SHA by a number of researchers in this region. The PSHA outcomes reported for this region have been recently discussed by Loi et al (2016) and Shoushtari et al (2016). These authors have discussed possible reasons for the variation in the published PSHA outcomes including the utilisation of different GMPEs and data sets (either synthetic or recorded ground motions), employment of different methodologies for PSHA and site-specific conditions.…”

Section: Introductionmentioning

confidence: 99%

“…To this end, updated strong ground motion records obtained from the Malaysian Meteorological Department (MMD) for the period of 2004-2016 in conjunction with recent findings on the suitability of existing and Figure 1. Location of Peninsular Malaysia on the Sunda Plate and the seismic sources around it (modified from Loi et al, 2016). The subduction lines, fault lines and tectonic boundary were obtained from ArcGIS 10.4.…”

Section: Introductionmentioning

confidence: 99%

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Revisiting seismic hazard assessment for Peninsular Malaysia using deterministic and probabilistic approaches

Loi

Raghunandan

Swamy

2018

Nat. Hazards Earth Syst. Sci.

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Abstract. Seismic hazard assessments, both deterministic and probabilistic, for Peninsular Malaysia have been carried out using peak ground acceleration (PGA) data recorded between 2004 and 2016 by the Malaysian Meteorological Department using triaxial accelerometers placed at 19 seismic stations on the peninsula. Seismicity source modelling for the deterministic seismic hazard assessment (DSHA) used historical point sources whereas in the probabilistic (PSHA) approach, line and areal sources were used. The earthquake sources comprised the Sumatran subduction zone (SSZ), Sumatran fault zone (SFZ) and local intraplate (LI) faults. Gutenberg–Richter law b value for the various zones identified within the SSZ ranged between 0.56 and 1.06 (mean=0.82) and for the zones within the SFZ, between 0.57 and 1.03 (mean=0.89). Suitable ground motion prediction equations (GMPEs) for Peninsular Malaysia along with other pertinent information were used for constructing a logic tree for PSHA of the region. The DSHA “critical-worst” scenario suggests PGAs of 0.07–0.80 ms−2 (0.7–8.2 percent g), whilst the PSHA suggests mean PGAs of 0.11–0.55 ms−2 (0.5–5.4 percent g) and 0.20–1.02 ms−2 (1.9–10.1 percent g) at 10 % and 2 % probability of exceedance in 50 years, respectively. DSHA and PSHA, despite using different source models and methodologies, both conclude that the central-western cities of Peninsular Malaysia, located between 2 and 4∘ N, are most susceptible to high PGAs, due to neighbouring active Sumatran sources, SFZ and SSZ. Of the two Sumatran sources, surprisingly, the relatively less active SFZ source with low magnitude seismicity appeared as the major contributor due to its proximity. However, potential hazards due to SSZ mega-earthquakes should not be dismissed. Finally, DSHA performed using the limited LI seismic data from the Bukit Tinggi fault at a reasonable moment magnitude (Mw) value of 5.0 predicted a PGA of ∼0.40 ms−2 at Kuala Lumpur.

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Section: Hazard Mapsmentioning

confidence: 96%

Section: Tectonic Setting and Seismicity Of Peninsular Malaysiamentioning

confidence: 99%