Upload
kosygin-leishangthem
View
221
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Nagaland State Transport
Citation preview
Mr.Santosh Kumar Scientist
Email: [email protected]
Web: http:\\www.isr.gujarat.gov.in
*
(ISR Established in 2006; New campus started 2008 end)
Seismology
Active 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 Earths Structure
Seismic Microzonation
Earthquake Prediction Research
DIRECTOR GENERAL
INSTITUTE OF SEISMOLOGICSL RESEARCH
Science and Technology Department
Government of Gujarat
Research Activitiess
*
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)Earthquake Recording Stations in Gujarat (by ISR)
Central Recording Station at
ISR-Gandhinagar
Seismic zoning Maps
India
Gujarat
*
*
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
*
50 Broadband seismographs and 50 strongmotion accelerographs for precise locations and mechanism of earthquakes
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.*
*
Instrumentation in GSNet
The VSAT-connected seismograph stations have Gralp CMG 3T 120-s triaxial broadband sensors and Gralp CMG-DM24 24-bit digitizers with external GPSThe 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 GPSThe recording is in trigger mode at 200 sps with threshold set at 0.002 g.The offline broadband seismograph stations are equipped with Gralp 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
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
Data Processing
Presently, all data processing is carried out in offline mode on SEISAN software (Havskov and Ottemller 2000). The online data are viewed on a 42-inch LCD monitor using the SCREAM (seismometer configuration, real-time acquisition and monitoring) application of GralpThe 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 dropDetection 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 5.0Local earthquakes are located with an error of 1-2 km in latitude and longitude and 45 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 kmThe teleseismic earthquakes in the 2,0005,000-km range are located with an error of about 1 degree in latitudeA 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
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).
Location of earthquakes in Gujarat from historic times to 2009.
Earthquake epicenters located by GSNet during 2008
Location of earthquakes recorded by GSNet during the period July 2006 to June 2009
Long-term migration of seismicity in Kachchh, Gujarat
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 permanent and several campaign mode GPS stations
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
QUESTIONS?