1. Mr.Santosh Kumar Scientist Email: sundriyal007@gmail.com Web: http:\\www.isr.gujarat.gov.in

2. (ISR Established in 2006; New campus started 2008 end)

3. SeismologyActive Tectonics Crustal Deformation Geophysics Earthquake Monitoring Source Mechanism Source Modeling Earthquake Geology Paleoseismology Recurrence Models GPS Tectonic Geomorphology Tsunami Gravity Magnetics Seismics GPR Strong motion Site-specific studies Microzonation Earthquake Engg. Ground Motion Three Main Groups Phys. of Earthquake process and Earth’s Structure Seismic Microzonation Earthquake Prediction Research DIRECTOR GENERAL INSTITUTE OF SEISMOLOGICSL RESEARCH Science and Technology Department Government of Gujarat Research Activitiess

4. Seismograph, GPS and Land Survey INSTRUMENTS AT ISR Seismological Instruments: Broadband Seismographs (50) Strong Motion Accelerographs (50) Global Positioning Systems: Geodetic grade GPS (40) Land Survey Instruments: Real Time Kinematic GPS (2) Handheld GPS (2) Total Station (1)

5. Earthquake Recording Stations in Gujarat (by ISR) Central Recording Station at ISR-Gandhinagar

6. Seismic zoning Maps India Gujarat

7. THE GUJARAT (INDIA) SEISMIC NETWORK (GSNet) 50 Broadband seismographs (20 connected to ISR via VSAT), 50 Strong Motion Accelerographs 50 Broadband seismographs and 50 strong motion accelerographs for precise locations and mechanism of earthquakes

9. SEISMIC MONITORING 50 Seismic Stations (nearly same as in the whole country) spread all over Gujarat. Av. 2.5 per district. 20 connected by VSAT with at ISR, Gandhinagar. Epicenter & magnitude of earthquakes determined within 10 minutes of arrival of seismic waves round the clock.

10. Instrumentation in GSNet  The VSAT-connected seismograph stations have Güralp CMG 3T 120-s triaxial broadband sensors and Güralp CMG-DM24 24-bit digitizers with external GPS  The continuous data is recorded at 50 sps  The strong-motion accelerographs consist of internal AC-63 GeoSIG triaxial forced balance accelerometers and GSR-18 GeoSIG 18-bit digitizers with external GPS  The recording is in trigger mode at 200 sps with threshold set at 0.002 g.  The offline broadband seismograph stations are equipped with Güralp 120-s triaxial CMG-3T broadband sensors and Reftek 24-bit 130-01 digitizers with external GPS.  Data are recorded in continuous mode at 100 sps. For more Information The Gujarat (India) seismic network (2008), Seismological Research Letters, 79 (6), 806-815

11. Noise Level The seismic stations of the network are located on varied geological formations including sandstone, basalt, shale, limestone, and hard soil of Mesozoic to Quaternary age

12. Data Processing  Presently, all data processing is carried out in offline mode on SEISAN software (Havskov and Ottemöller 2000).  The online data are viewed on a 42-inch LCD monitor using the SCREAM (seismometer configuration, real-time acquisition and monitoring) application of Güralp  The earthquakes are located with HYPOCENTRE utility and ML/mb/MS are calculated on the basis of distances.  The components of individual stations are rotated, and spectral analysis is carried out for estimation of Mw and source parameters like seismic moment, fault radius, corner frequency, and stress drop Detection Capability  The network recorded and located about 4,000 local earthquakes from July 2006 to OCT 2009 with magnitudes in the range of 0.5 to 5.0  Local earthquakes are located with an error of 1-2 km in latitude and longitude and 4–5 km in depth.  M2 is the detection capability in most parts of Kachchh, M3 in the mainland Gujarat and earthquakes of M ≥ 3 are well-recorded up to 200-km distance.  The network can record earthquakes of M ≥ 4 within about 1,000 km, M ≥ 5 within about 2,000 km, M ≥ 5.5 within about 5,000 km, and M ≥ 6 within about 10,000 km  The teleseismic earthquakes in the 2,000–5,000-km range are located with an error of about 1 degree in latitude

13. A sample broadband record of an Mw 4.7 earthquake in the Kachchh region of Gujarat recorded at the Khavda (KAV0) station (epicentral distance 88 km) on 13 May 2007

14. A sample broadband record of an Ms 8.3 earthquake on 12 September 2007 in southern Sumatra, Indonesia, and recorded at the Kadana (KAD0) station (epicentral distance 5,024 km).

15. Location of earthquakes in Gujarat from historic times to 2009.

16. Earthquake epicenters located by GSNet during 2008

17. Location of earthquakes recorded by GSNet during the period July 2006 to June 2009

18. Long-term migration of seismicity in Kachchh, Gujarat

19. Map showing GPS station network of ISR for crustal deformation studies 35 Permanent (red triangle- installed, green triangle- being installed) 11 Campaign mode stations (blue dots)

20. Multi Parameter Geophysical Observatory ( MPGO) 3 Nos. Strain Meter 1 no. Supercondutivity Meter 1 no. Magnetometer 3no Water Level Measurement instrument 5 no Radon Gas Measurement 5 nos GPS BBS SMA

21. QUESTIONS?