The existing and upgrading The existing and upgrading national seismological national seismological network in vietnamnetwork in vietnam

Le Tu Son Le Tu Son Institute of Geophysics, VAST Vietnam

Vietnam Vietnam seismological seismological network network composes of 24 composes of 24 short-period short-period stations (an stations (an telemetry array telemetry array with 9 station with 9 station and 15 and 15 autonomous autonomous stations). stations).

Transmission systemTransmission system

Recording SystemRecording System

Autonomous stationAutonomous station

Telemetry Telemetry stationstation

Recording system at the centerRecording system at the center

The specifications of the The specifications of the seismological networkseismological network

Seismometer:Seismometer: Mark Product 1Hz LC-3D; Mark Product 1Hz LC-3D; Sensitivity:Sensitivity: 176/V/M/S176/V/M/S

Damping Damping 0.70.7 Amplifier GainAmplifier Gain 64 (2^6) *64 (2^6) * Digitizer 15 bit for 10 VoltDigitizer 15 bit for 10 Volt 0.305 mV/count0.305 mV/count Filter:Filter: Cutof freq.Cutof freq. 24 Hz24 Hz Butt. FilterButt. Filter 5 poles5 poles High-passHigh-pass 0.1 Hz0.1 Hz -1 pole-1 pole

Data processing: Data processing: SEISAN softerwareSEISAN softerware

An example of the An example of the seismic records seismic records from Vietnam from Vietnam seismological seismological network (the network (the event of M=5.3 in event of M=5.3 in Dienbien city, Dienbien city, 19/02/2001). All of 19/02/2001). All of the seismic the seismic records are digital records are digital

24 Taiwan portable broadband 24 Taiwan portable broadband seismic array in northern Vietnam.seismic array in northern Vietnam.

STS-2/Trillium 40 + Q330STS-2/Trillium 40 + Q330

ProjectProject

Improvement of National Improvement of National Seismic Network for Seismic Network for

Earthquake informing and Earthquake informing and Tsunami warningTsunami warning

Institute of Geophysics

Distribution of Distribution of proposal proposal seismic seismic

network network The distance The distance

between stations between stations from 100 km to from 100 km to 200 km.200 km.

36 stations on the 36 stations on the whole countrywhole country

Real time workingReal time working

Seismic monitoring networkSeismic monitoring network

System configuration of each System configuration of each seismic stationseismic station

AIME OF THE SEISMIC SYSTEMAIME OF THE SEISMIC SYSTEM

• DETECT EQ AND LOCATE EQ MAG 3.5 DETECT EQ AND LOCATE EQ MAG 3.5 THAT OCCURR IN THE WHOLE COUNTRY THAT OCCURR IN THE WHOLE COUNTRY

• DETECT EQ AND LOCATE EQ MAG 6.5 DETECT EQ AND LOCATE EQ MAG 6.5 THAT OCCURR IN THE SOUTH CHINA SEATHAT OCCURR IN THE SOUTH CHINA SEA

• REDUCE THE TIME OF DATA REDUCE THE TIME OF DATA PROCESSINGPROCESSING

BMG

Thank you for your attention!Thank you for your attention!