Adisorn Foongkajorn Chiang Mai Seismic Station. Abstract A drop of number of seismicity is a seismic precursor (Bath,1979). During 1960-2005, earthquakes.

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Presentation transcript:

Adisorn Foongkajorn Chiang Mai Seismic Station

Abstract A drop of number of seismicity is a seismic precursor (Bath,1979). During , earthquakes in Sumatra-Andaman seismic belt had occurred continually. After deployment of the World Wide Standardized Seismograph Network (WWSSN) in 1960’s, instrumentally seismic data of the region has been collected systematically. According to this study more than 3000 of the earthquakes of magnitude  5 in the Sumatra- Andaman seismic belt were analyzed and mapped. About 10% decline of seismicity was found in 1990’s. Then the most destructive event of the region occurred on 26 December 2004 with consequently high seismicity.

Scope of the study

Seismic Precursors

Seismic precursors - Decreasing Vp/Vs (10-20% change) Electrical resistivity (15% change) Number of seismicity - Increasing (geodetic measurements) Tilt Vertical motion Volumetric strain (Bath, 1979:298)

First Episode of the Great Sumatra Earthquake

Indian Plate that has played an important roll in the Sumatra- Andaman Seismic Belt

Panoramic Scene of the Sumatra- Andaman seismic belt

Origin of Volcanic Island Arc as Andaman and Nicobar were originated

Epicentral Distribution in Sumatra-Andaman seismic belt during

Number of the Earthquakes in Sumatra- Andaman Seismic Belt during YearNo.Change(%) * * Development of highly sensitive seismograph Total 3152

Number of the Earthquakes in Sumatra-Andaman Seismic Belt during

MagnitudeNumber  91  81  717  6186  Magnitude of the Earthquakes in Sumatra-Andaman seismic belt during Total 3152

Magnitude of the Earthquakes in Sumatra-Andaman seismic belt during

Depth Distribution of the Earthquakes in Sumatra-Andaman seismic belt during

Cumulative Depth Distribution of the Earthquakes in Sumatra-Andaman seismic belt during

Cumulative Depth Distribution of the Earthquakes in Sumatra-Andaman seismic belt during

Depth Contour of the Earthquakes in Sumatra- Andaman seismic belt during

Depth of the Earthquakes in Sumatra- Andaman seismic belt during

Rupture, surface wave propagation and co-seismic displacements measured by GPS of the great Sumatra earthquake on 26 December 2005

Aftershock Distribution of the great Sumatra earthquake on 26 December 2005

Magnitude of the Earthquakes in Sumatra- Andaman Seismic Belt on 26 December 2004

Depth of the Earthquakes in Sumatra- Andaman Seismic Belt on 26 December 2004

Major and Great Earthquakes in Sumatra- Andaman Seismic Belt during

Major Earthquakes in Sumatra-Andaman Seismic Belt during

Major Earthquakes in Sumatra-Andaman Seismic Belt during

Conclusions According to the study more than 3000 of the earthquakes of magnitude  5 in the Sumatra- Andaman seismic belt during were analyzed and mapped. About 10% decline of seismicity was found in 1990’s. Then the most destructive event of the region occurred on 26 December 2004 with consequently high seismicity. The drop of number of seismicity is precursory potential for earthquake prediction.

Thank you very much