Seismic Source Mechanism in Northern Thailand
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Seismic Source Mechanism in Northern Thailand During September 1997 to January 2000 PowerPoint PPT Presentation

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Seismic Source Mechanism in Northern Thailand During September 1997 to January 2000. Abstract

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Seismic Source Mechanism in Northern Thailand During September 1997 to January 2000

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Seismic Source Mechanism in Northern Thailand

During September 1997 to January 2000

  • Abstract

  • The idea of downloading seismic signals to any Personal Computer elsewhere to analyze and determine preliminary solution of seismic parameters e.g. origin time, epicenter, and magnitude, had been initiated. To achieve this aim, an excellent computer software called DIMAS (Display, Interactive Manipulation and Analysis of Seismograms) was applied to solve the seismic source mechanism of northern Thailand, detected by the IRIS and DIMAS at CHTO during September1997 to January 2000. This software cannot only determine the basic parameters of an earthquake but also identify the focal mechanism that caused the event.

  • During this period, it was found that most earthquakes occurred in the area were resulted from the mechanism mainly of normal faults. Their major trend is northeast-southwest which is the same direction of major faulted graben in northern Thailand. The collision of the Indo-Australian plate and the Eurasian plate is considered to be the main driving force that has caused faulting and induced seismicity in this region.

  • Potential Seismic Source Zones in Continental Asia Source :

    Seismotectonic Map in Continental Asia Source :

    Seismicity Map of Thailand and Adjacent Areas Source :

    Fault zoneLatitudeLongitude


    Chiang Saen19.5-20.599.0-100.5

    Mae Tha18.5-19.598.5-99.5



    Moei-Uthai Thani17.0-18.598.0-99.0

    Mae Hong Son18.5-19.597.5-98.5





    Map of fault zones in northern Thailand

    Map of active faults in Thailand and adjacent areas(Lacassin et al., J. Geophys. Res., 1997)

    Fault Types

    dipfault type






    Dip Distribution of Seismic Source Zones in Northern Thailand

    Fault Zone Dip (%) Average 0-30 31-4445-8485-90

    Chiang Saen13.3323.3356.676.6753.01

    Mae Hong Son26.670.0060.0013.3356.08

    Mae Tha10.005.0070.0015.0067.76



    Moei-Uthai Thani28.570.0042.8628.5764.05





    Seismicity and Source-Mechanism Map of Northern Thailand


    The examples of particle motion analysis of events during the period of the study

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