Probabilistic seismic hazard assessments for Northern Southeast Asia (Indochina): Smooth seismicity approach

Teraphan Ornthammarath, Pennung Warnitchai, Chung Han Chan, Yu Wang, Xuhua Shi, Phuong Hong Nguyen, Le Minh Nguyen, Suwith Kosuwan, Myo Thant

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We present an evaluation of the 2018 Northern Southeast Asia Seismic Hazard Model (NSAHM18) based on a combination of smoothed seismicity, subduction zone, and fault models. The smoothed seismicity is used to model observed distributed seismicity from largely unknown sources in the current study area. In addition, due to a short instrumental earthquake catalog, slip rate and characteristic earthquake magnitudes are incorporated through the fault model. To achieve this objective, the compiled earthquake catalogs and updated active fault databases in this region were reexamined with consistent use of these input parameters. To take into account epistemic uncertainty, logic tree analysis has been implemented incorporating basic quantities such as ground-motion models (GMMs) for three different tectonic regions (shallow active, subduction interface, and subduction intraslab), maximum magnitude, and earthquake magnitude frequency relationships. The seismic hazard results are presented in peak ground acceleration maps at 475- and 2475-year return periods.

Original languageEnglish
Pages (from-to)69-90
Number of pages22
JournalEarthquake Spectra
Volume36
Issue number1_suppl
DOIs
StatePublished - 1 Oct 2020

Keywords

  • PSHA
  • Southeast Asia
  • global earthquake model
  • seismic hazard map
  • smooth seismicity

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