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MALAGASY SEISMIC NETWORK RAZAFINDRAKOTO Hoby – RAMANANTSOA Andry Metadata 2009

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MALAGASY SEISMIC NETWORK RAZAFINDRAKOTO Hoby – RAMANANTSOA Andry Metadata 2009. OUTLINE Historical of the Malagasy seismic network Data processing Conclusion. OUTLINE Historical of the Malagasy seismic network Data processing Conclusion. SEISMIC STATIONS IN MADAGASCAR.

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slide1

MALAGASY SEISMIC NETWORK

RAZAFINDRAKOTO Hoby – RAMANANTSOA Andry

Metadata 2009

slide2

OUTLINE

  • Historical of the Malagasy seismic network
  • Data processing
  • Conclusion
slide3

OUTLINE

  • Historical of the Malagasy seismic network
  • Data processing
  • Conclusion
slide4

SEISMIC STATIONS IN MADAGASCAR

1898: TAN

1971: AVY

1972: VTY, FRR

1978: OBY

1982: ABM

1994: ATG

1995: MDV

2001: FIRM

2007: ABPO

2008: FOMA

The Malagasy first seismic station was installed in Antananarivo in 1898. The network has been improved and composed now by 11 stations.

slide5

Seismometer ZM500

Seismometer 3 components ZM500 and HM500

slide6

OUTLINE

  • Historical of the Malagasy seismic network
  • Data processing
  • Conclusion
slide7

LOCATION OF SEISMIC EVENTS

Until 1972 EYEWITNESS REPORT

1972 – 1988 GEOMETRICAL METHOD

1988 – 2001 ISIS

LEAST SQUARE METHOD

2001 – now ONYX

slide8

SEISMICITY MAP OF MADAGASCAR

Seismotectonic map and location of the seismic network: 1 D faults; 2 D thrusts; 3 D main towns; 4 D seismic stations; 5 D seismic activity for magnitudes 4.0 located by the Malagasy array between 1979 and 1994; 6 D known earthquakes of magnitude 5.0

between 1914 and 1994; 7 D intensities VII recorded between 1897 and 1960; 8 D focal mechanisms (Bertil et al., 1998)

Seismicity map of Madagascar between 1975 and 2006 (Rakotomalala,2007)

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OUTLINE

  • Historical of the Malagasy seismic network
  • Data processing
  • Conclusion
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The more extended the network is, the better the results are

Suggestion: -to use all the stations for the seismic location

- to create a new database for the data from all the stations in Madagascar

  • enlarge the network to the western part
  • Data exchange in order to study the plate tectonics
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THANK YOU

MISAOTRA TOMPOKO

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