Download Seismic Network in Sri Lanka

IRIS workshop
on
“Managing Waveform Data and Related
Metadata from Seismic Networks”
Hotel Windsor Suites, Bangkok, Thailand
08-13, January, 2012
Ashvin Wickramasooriya
Senior Lecturer in Earth Science
South Eastern University of Sri Lanka
CONTENTS
OVERVIEW
SRI LANKAN SEISMIC NETWORK
SOUTH EAST SEISMIC STATION
SPECIFICATIONS:
SENSORS/LOGGER/SOFTWARE
Overview
There was no seismic network system for
Sri Lanka before 2005
However, a single seismic station was
established in 1996 under the Global Seismic
Network (GSN) at Pallekale, Kandy
First Sri Lankan Seismic Network has
established in June, 2005 funded by the
Japanese Government (JICA)
Initial Plan of establishing this seismic network
include :
1) Detect a domestic earthquake and calculate
Epicenter and Magnitude
2) Post processing function
3) Data communication: Telephone Line (Dial up)
(To reduce the running cost)
4) Four Seismic Stations (To calculate Epicenter)
SRI LANKAN SEISMIC NETWORK
There are four seismic stations were established
under this network at four universities.
Local station(RJR)
Rajarata Univ.
Central Station (PRD)
Peradeniya Univ.
Local station(RHN)
Ruhuna Univ.
Local station(EST)
South-East Univ.
June , 2005 Funded by JICA
Overview (Function)
1) Continuous Data recording (6ch, one month)
6ch: Acceleration 3ch, Velocity 3ch
2) Automatic Trigger Function and Call to Central
Station (Peradeniya)
3) Automatic Data correction from Central Station to
Local Station (Manual correction is also Available)
4) Automatic Processing Function (SEISAN)
Epicenter(Domestic) , Magnitude
5) Post Processing Function (SEISAN)
Central Station (Peradeniya)
TCP/IP
Protocol
Converter
UNIV.
LAN
Personal
Software for Central Station
Data Collection from each
stations
Computer
Short period
seismometer
Data
Logger
Hub
(6ch)
Forcebaranse
servo
accelerometer
UPS
Router
with GPS
Modem
Data Storage
Data Analysis
*Epicenter
*Magnitude
*Spectrum etc
Printer
Maintenance (Each station )
Concrete Base
Outside
Inside
Telephone Line
RAJ
RHN
SET
Local Stations
(Rajarata, Ruhuna, South-Eastern)
TCP/IP
Protocol
Converter
Short period
seismometer
Personal
Computer
Data
Logger
Hub
(6ch)
Software for Local station
Data Collection (Own site,
Manual)
Data Storage (Do)
Maintenance (Own site)
UPS
Router
with GPS
Forcebalance
servo
accelerometer
Concrete Base
Outside
Modem
Printer
Inside
Telephone Line
Central Station
SOUTH EAST SEISMIC STATION
1. Sensor:
1)Forcebalance Servo Accelerometer :Episensor
2)Seismometer (1Hz Geophone):GS-1
2. Data Logger:
24bit Data Logger : Altus K2
3. Data Acquisition:
PC Based System : Recording: SMARTS
Processing: SEISAN
4. Communication:
Telephone line (Analog, Dial-up)
Sensors
Seismometer
GS-1
• Epi-sensor
• GS-1
Accelerometer
Episensor
 Suitable for Strong motion
 Suitable for Micro-seismic
Data logger
Site Installation
Data Processing system
Installation
Resolution & Dynamic Range
• Full scale of K2 : 2.5V
• A/D resolution : 2.5V/223 = 0.298 microV
• Acceleration: (0.23mgal) – 1960 gal
– Effective resolution: 10 mgal ?
• Velocity: (0.0745 microkine) – 625 mkine
– Effective resolution: 10 microkine?
• GS-1 for small earthquake
• Epi-sensor for strong motion
Software configuration
Local Stations
SMARTS
Trigger
Information
(text file)
SMARTS-Sri-Lanka
(Program package)
Continuous
Waveform
(evt file)
evt2sei.pl
Waveform
(SEISAN
format)
event file
(SEISAN
format)
SEISAN
Central Station
Thank You