Download Seismic Networks Operated by Central Weather Bureau in

Seismic Networks Operated
by Central Weather Bureau in Taiwan
Ta-Yi Chen
Central Weather Bureau
Outline
•Seismicity in Taiwan
•CWB Seismic Networks
•Integrated Seismic
Network
•System Architecture
•Data Format
Seismicity in Taiwan
Magnitude Range
Average
(Numbers/Year)
7 ≦ML
0.1
6 ≦ML＜7
2.6
5 ≦ML＜6
22
4 ≦ML＜5
197
0 ≦ML
19,175
Current Seismic Networks（since 1991）
•
Short-Period Seismic Network (71)
•
Dynamic Range : 12bit
Sampling Rate : 100sps
Type of Seismometer: S13
Type of telemetry : Telephone Line
Time mark is given in Central Station.
Strong-Motion Seismic Network (110)
Dynamic Range : 16bit
Sampling Rate : 50sps
Type of Seismometer: Smart24a
Type of telemetry : Telephone Line
Time mark is given in Central Station.
S13 in Bore-Hole
S13 on Surface
Smart24a on Surface
Updated Seismic Network
•
Integrate short-period and strong-motion
data streams into 1 recorder (Smart24a).
• Dynamic Range : 24bit
• Sampling Rate : 100sps
• Type of Telemetry : Frame Relay, ADSL
Time mark is given on site by GPS.
68 station done
Broad-Band Seismic Network
•
Broad-Band Seismic Network (33)
Dynamic Range : 24bit
Sampling Rate : 100sps
Type of Seismometer: CMG-3ESP,
CMG-40TD
Type of Digitizer: DM24
Type of telemetry : Frame Relay
Time mark is given on site by GPS.
CMG-3ESP
DM24
Bore-Hole Seismic Network
• Dynamic Range : 24bit
• Sampling Rate : 100sps
• Type of Telemetry : Frame Relay
• Type of Digitizer: Smart24r
Time mark is given on site by GPS.
• Each site is equipped with 3
different instruments
• ~300 m in depth
Done 17 stations Have Been Done
Phase II
Phase III
70 stations in Final Step
Cable Ocean Bottom Seismic Network
• Dynamic Range : 24bit
• Sampling Rate : 100sps
• Type of Telemetry : Frame Relay
Time mark is given on site.
Land Station
Latitude
Observed Node
•
•
•
Black line: achieved in 2011
Blue line: ongoing project as the phase II
White line: planned project as phase III
Longitude
Sea Depth
Meter
Integration for all CWB Seismic Networks
Central Weather Bureau, Taiwan
Updated Seismic Networks
Bore-Hole Seismic Network
Cable Ocean Bottom Seismic Network
Institute of Earth Sciences, Academia Sinica , Taiwan
Broadband Array in Taiwan for Seismology (BATS)
Yangmingshan (YMS) Volcano Seismic Network
Other Institutions
Incorporated Research Institutions for Seismology (IRIS)
: 3 JMA (Japan) Stations
Policy of SCNL
Station
Channel
Channel (Instrument Type)
Network
Location
Network (Network Type)
Ch1~Ch3
Strong Motion (Z，N，E)
CWB_BH
CWB Bore Hole
Ch4~Ch6
Short Period (Z，N，E)
CWB_BB
CWB Broad Band
Ch7~Ch9
Broad Band (Z，N，E)
CWB_SMT
CWB Smart24
IRIS_JPN
IRIS Japan
IES_YMS
IES YMS
IES_BATS
IES BATS
Location (Position of Instrument)
01
Surface
02
Bore Hole
03
Ocean Bottom
Example: Cheng Kung Station
測站
Station
Channel
Network
Location
Acceleration of Smart24
CHK
Ch1~Ch3
CWB_SMT
01
Short Period of Smart24
CHK
Ch4~Ch6
CWB_SMT
01
Broad Band in Surface
CHK
Ch7~Ch9
CWB_BB
01
Broad Band in Bore Hole
CHK
Ch7~Ch9
CWB_BB
02
Integrated Seismic Network
Total 144 Sites
249 Instruments
68
17
33
21
9
3
The Earthworm system is used for
integrating seismic networks.
Operators are able to request different
kinds of real-time data from this
Earthworm system.
System Architecture
Smart24a
BH
BB
OBS
Others
TCP/IP
Receiving
Layer
Integrated
Layer
Application
Layer
module
module
module
module
module
Data Exchange
Earthworm
Earthworm
Earthworm
Earthquake Rapid
Report
Earthquake Early
Warning
Fault Plane
Solutions
Earthquake
Catalog
Earthworm
Tsunami Early
Warning
CWB24 Format
File
Header
Port
Header
Data (4 bytes for 24 bits data)
(Component , Port , Points)
File Header (24 bytes)
Content
Data Type
1
System ID
4 bytes char
2
Year
2 bytes int
3
Milli-second
2 bytes int
4
File length
(sec)
5
Port Header (32 Bytes each port)
Content
Data Type
1
Station
4 bytes char
TAP1, HWA ,CHN5, ……
2
Instrument
4 bytes
char
FBA, SP, BB
2 bytes int
3
Component
Order
3 bytes char
VNE
Month
1 byte int
4
GPS status
1 byte int
0：unlock, 1：lock ,
2：unknown, 3：data lost
6
Day
1 byte int
5
Null (Empty)
2 bytes int
Un-used
7
Hour
1 byte int
6
Number of Comp
1 byte int
3
8
Minute
1 byte int
7
Location
1 byte int
9
Second
1 byte int
1：Surface , 2：Borehole ,
3：Ocean Bottom
10
Sample Rate
1 byte
unsigned int
8
Net Name
4 bytes
char
11
Number of
Port
2 bytes int
9
Null (Empty)
12 bytes int
12
Null (Empty)
6 bytes int
Un-used
GPS Status
CHY
Integrated CWB Seismic Network
Bore Hole
IES-YMS
Broad Band
IRIS-JPN
Acceleration
Acceleration
IES-BATS
Short Period
Short Period
http://cwbsnbb.cwb.gov.tw/index_en.htm
http://www.cwb.gov.tw/V7e/earthquake/
Thanks for your attention.