Spatial variability of earthquake hazard parameters, return periods and probabilities of earthquake occurrences in the eastern Himalayan seismic belt

Sandhu, Manisha; Yadav, R. B. S.; Kumar, Rajiv; Baruah, Santanu; Singh, A. P.; Mishra, Minakshi; Yadav, Jairam Singh

doi:10.1016/j.pce.2022.103194

Cited by 4 publications

(2 citation statements)

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“…From the point of view where the b-value in Zones 2 and 3 (b ~ 0.8) is much lower relatively compared to that of Zone 1 (b = 1.2), we can deduce that the accumulated stress stored in layered subsurface rocks in Zones 2 and 3 is relatively higher than that in Zone 1 (see for comparison [32][33][34][35]). In this context, both Zones 2 and 3 could be considered high-stress tectonic regimes with seismic hazard potential of large amounts of energy release.…”

Section: Resultsmentioning

confidence: 85%

“…Seismic parameters, a-value, and b-value, can be used to describe respectively the rate of seismicity and the relative proportion of small to large earthquakes of tectonic origin in a region of interest [27,[29][30][31]. In this context, the a-value refers to seismic activity, and the b-value describes tectonic regimes with distinct stresses where a high (low) b-value is associated with a low-stress (high-stress) regime [32][33][34][35]. We provide here in Figure 2 the results of accurate calculations of the a and b values, including a value of M c in the form of FMD curves for each seismogenic zone given in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

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Vulnerability in the Java northen region in association with earthquake sources of tectonic origin

Fahmi,

Realita,

Risanti

et al. 2023

J. Phys.: Conf. Ser.

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While threats from the subduction zone off the Java south coast remain persistent, potential sources of a tectonic earthquake centered in the Java northern areas come into play. Despite their enigmatic presence and a clear shift of the sources from the mainland to the north from hypocentre relocation studies, this poses a danger to the community in the Java northern coastlines, increasing vulnerability to earthquake and tsunami hazards. The main aim of this study is thus to evaluate seismic hazards and corresponding analysis, hence assessing vulnerability with respect to the presence of active faults in the northern regions. The methods used here included a-value and b-value calculations inferred from seismogenic zonation made available for the study area and source mechanism determination derived from seismic inversion for two recent events recorded at the Java Sea. The results revealed that the a-value reached 8.55 in Zone 1, reflecting a high seismicity rate over the northern areas of West Java and Banten provinces, and the b-value was about 0.8 in Central Java and East Java, implying a relatively high-stress tectonic regime. The moment tensor solutions yielded sizes M w 6.7 at a depth of 539 km and M w 7.0 at a depth of 594 km with a major double-couple component for the normal faulting types of mechanism, consistent with reference. The results suggest the significance of awareness of seismic threats possible to occur in the Java northern regions; hence more investigations into detailed seismicity in the regions of interest for future research direction.

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Section: Resultsmentioning

confidence: 85%