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DIGITAL SEISMIC NETWORK OF BANGLADESH ( For Seismological Workshop on ‘Managing Waveform Data and Related Metadata for

DIGITAL SEISMIC NETWORK OF BANGLADESH ( For Seismological Workshop on ‘Managing Waveform Data and Related Metadata for Seismic Networks’ ). MD. MUZAMMEL HAQUE TARAFDER & MD. MOZIDUL ISLAM Bangladesh Meteorological Department. H i m a l a y a s. Bangladesh. Bay of Bengal.

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DIGITAL SEISMIC NETWORK OF BANGLADESH ( For Seismological Workshop on ‘Managing Waveform Data and Related Metadata for

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  1. DIGITAL SEISMIC NETWORK OF BANGLADESH( For Seismological Workshop on ‘Managing Waveform Data and Related Metadata for Seismic Networks’ ) MD. MUZAMMEL HAQUE TARAFDER & MD. MOZIDUL ISLAM Bangladesh Meteorological Department

  2. H i m a l a y a s Bangladesh Bay of Bengal Basic Features of Bangladesh • Small south Asian developing country, Area 1,43,999 sq km • Population: 140 million • Mostly surrounded by Indian territory and a small portion in southeast by Myanmar. • North-northeastern part is mainly hilly area and the rest are plain land • The southern side facing to the Bay of Bengal. Climatological Condition • Warm moist and Tropical Climate • Moderately warm temperature • Many natural calamities like Tropical Cyclones, Tornados, Floods, Droughts, River erosion and occasionally earthquakes are very common in Bangladesh

  3. TECTONIC STATUS OF THE REGION Indian plate is currently penetrating into Eurasian plate and rotating slowly anticlockwise and bending downwards beneath the southern edge of the Himalaya and Tibet. Burmese microplate is moving to the west direction at a rate of 20 mm/yr and Indian plate is moving at a rate of about 50 mm/yr to the NNW direction.

  4. Active Faults in and around Bangladesh Dauki Fault, Tista Fault, Kishoreganj Fault Sitakundo-Teknaf Fault Tripura-Ctg. Fold Belt Shillong Plateau Sagaing Fault Himalayan Collision Zone

  5. Past Earthquake Record of the Region(Source: Harvard CMT Catalogue 1976-2005) • Most of the country lies in active seismic zones making the occurrence of deadly earthquakes as a frightening possibility. • Many of the earthquakes have occurred in the Northeastern part of the country and in the southeastern area.

  6. TRENDS OF P AND T AXES OF EARTHQUAKES (1976-2005) Due to NE movement of Indian plate; the shield area of Indian Peninsula including most of the southwestern part of Bangladesh is subjected to stress, which has caused reactivation of faults and associated seismic activity. On the other side the continuous horizontal compression of India against Tibet, following the collision, is leading to the accumulation of strain, which at times is released along the Main Central Thrust (MCT) andthe Main Boundary Thrust (MBT). Bhuj Trend of T-axes of Normal Faulting Trend of P-axes of Thrust Faulting

  7. Chittagong ● ●Existing Station (BMD) ● Proposed Station (DUEO) Bangladesh Seismic Network • Central data centre and an observatory in BMD headquarter. • Three other observatory connected to main data centre. • Data centre is connected to GTS Link. • Global exchange of earthquake data through GTS. Rajshahi ● Khulna ● ● Patuakhali BMD is also going to establish comm. network for exchange seismic data from proposed stations within June ‘08.

  8. Schematic Diagram of Seismic Network

  9. AccelerometerModel: BBAS-2 Short-period (Model: FSS-3JC-V-104) Borehole Seismometer (Model FBS-60D) Broadband Seismometer (Model: FBS- 60D) • 3-component Integrated; • Force-balanced Electronic Feedback; • Displacement transduction; • Frequency Range: 2s～50Hz; • Dynamic Range:>120dB; • 3-component; • Displacement Transduction and Force-balanced Electronic Feedback; • Dynamic Range: >130dB; • Frequency Range: DC～80Hz; • Measuring Range: 2g; • 3-component; • Frequency Band：120s～40Hz; • Remote Controllable • Autocenter while powering on • Sensitivity1000V/(m/S)（single）& 2000 V/(m/S)（differential） • Frequency Band: 2s～50Hz • Dynamic Range: >120dB • Suitable Well Diameter:φ125mm～φ160mm Equipments are being used • Digital Broadband (04), Digital Bore hole (02), • Accelerometer (06) • Short period Seismometers (04) • Recorder for BB & BH Seismometers (EDAS-24IP). • Recorder for Triaxial Accelerometer (GSMA-2400IP) • Real time seismic monitoring unit. • Seismic data processing and analysis System (EDSP-IAS). • GPS Time synchronization for Seismic sensors and Continuous data acquisition system for gr. Movement. • Communication facilities

  10. DIGITIZER 24 Bit AD converter TCP/IP EDAS-24IP Earthquake Data Acquisition System Sensitivity of EDAS-24IP 10V scale 1589nV/count 20V scale 3179nV/count 5V scale 794nV/count

  11. 1 2 3 4 5 1 ２ 3 ４ 6 5 7 Structure of EDAS-24IP • POWER: Power Indicator showing EDAS-24IP power supply status • GPS: GPS working status Indicator; • HD/TRIG: Outer storage powering indicator; • LAN: Network communication status indicator; • Battery Box: Built-in 1900mAH N-H Rechargeable Battery and Outer Storage • Sensor A Socket:connect to 3-componentSeismometer A • Sensor B Socket: connect to 3-component Seismometer B • GPS Antenna Socket: connect to GPS Antenna • Power Socket: connect to outer +12V power supply • COM1 Hyper Terminal Socket: connecting to the Hyper Terminal of the computerthrough specialcable • COM2 Serial Communication Socket: RS-232Computable Serial Port connecting tocomputer or serial communication equipment • LAN Socket: Connecting to network Hub or Router through special twisted-pare cable.

  12. Seismic data recorded in the Digitizer 1. Compressed format 2. Two stages storage to reduce power consumption real-time seismic data first stage: DOC (about 1-3 day data ) second stage: CF cards ,save Save automatically 128MB DOC（Disk On Chip）--inner memory Root file system Stored Linux system code，application code ,etc Temporary data （FTP buffer directory) After filling 80% of the DOC space power of CF card automatically on.

  13. File types recorded in EDAS-24IP Inner DOC & external CF card 4 types data: 1.Seismic continuous data: directory ctn；can close by software to save storage space filename: yyyymmddhhmmssch.dat 2. Seismic event data (evt): choose on /off by software 3. Calibration data (cal): pul.sed,sin.sed,bin.sed 4. Log data(name: yyyymmdd)

  14. How to get data 1. real-time data flow； via Data COM / LAN port, run EDAS-IP-SMS software, connect to EDAS-24IP , display data wave and save files in computer 2. ctn /evt/cal/log file: Via LAN port, connect to EDAS-24IP, FTP download (EDAS-IP-SMS or CuteFTP/FlashFTP etc) 3. EDSP-IAS softwareis using for analyzing & viewing wave files

  15. Recorded waveform

  16. Thank you all

  17. Specification of Broardband Seismometer

  18. Sensitivity • Sensitivity equals the input voltage corresponds to each Count (digital ) • for example： EDAS-24L 10V scale EDAS-24IP 10V scale 1589nV/count=10 (V)/6291455(count) 20V scale 3179nV/count 5V scale 794nV/count

  19. Date: 2003/ 7/26 Centroid Time: 23:18:24.6 GMT Lat 22.90N Long: 92.31E Mw = 5.6 mb = 5.5 Depth: 15 Km Date: 2003/ 7/27 Centroid Time: 12: 7:33.3 GMT Lat: 22.83N Long: 92.34E Mw = 5.4 mb = 5.2 Depth: 15 Km

  20. Name and Date of event Dhurbi earthquake,Jul 02 1930 Magnitude(R.S) 7.1 Affected region Dhurbi, Assam, rangpur 250 Epicenter from Ctg. (Kms) Bihar Nepal earthquake, Jan 15 1934 8.3 Bihar, Nepal 510 Bengal Earthquake , Jul 14, 1885 7.0 Bogra,Serajganj, Jamalpur,Sherpur, Dhaka. 170 Assam earthquake , Aug 1950 8.5 Assam, Bengal 780 Cachar Earthquake, Jan 10, 1869 7.5 Sylhet, Cachar, Assam 250 Apr 1962 8.5 Chittagong, Arakon,Mynamar Great India earthquake, June 12 1897 8.7 North Bengal, Comilla 230 Srimangol earthquake, Jul 08 1978 7.6 Srimangol and surrounding area 150 Nov 06, 1997 6.0 Chittagong and surrounding area ---- Moheshkhali, Jul 22, 1999 5.2 Chittagong, Cox’s bazar --- Some Significant Earthquakes

  21. Sensitivity EDAS-24IP 10V scale 1589nV/count=10 (V)/6291455(count) 20V scale 3179nV/count 5V scale 794nV/count

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