Download - Antelope Usage at Hong Kong Observatory
Antelope Usage at Hong Kong Observatory
WOO Wang-chun
Global Seismographic Network
Hong Kong Po Shan (HKPS)a GSN affiliate station
Po Shan Seismograph Station (HKPS)
Operational since 18 Feb 2010
HKPS (Side View)
HKPS (Top View)
As-built Plan of the Seismic Chamber
As-built Plan of the Plinths
Master Network Diagram
Geodetic Survey
dbnoise of HKPS
HKPS on IRIS DMC
Geophysical Services of Hong Kong Observatory
Earthquake Monitoring Global Earthquake Information Services Near Events (within 200km of Hong
Kong) Locally Felt Earth Tremors
Tsunami Watch South China Sea Pacific Global
Products Earthquakes
Quick Earthquake Messages Strong Earthquake Reports Locally Felt Earth Tremor Reports
Tsunamis Tsunami Warning Tsunami Information Bulletin Special Press Releases
Media briefing and interviews Educational web pages, leaflets, talks
Quick Earthquake Messages
Quick Earthquake Messages
Criteria M6.0+ worldwide
Dissemination On Twitter By emails / SMS to special users
(media, news agencies, government bureaux/departments)
On Weibo (later this month) In Chinese (Traditional) and English Normally issued by computer
automatically On average posted in 12 minutes after
origin
Strong Earthquake Reports
Strong Earthquake Reports
Criteria M6.0+ worldwide (same as Quick Earthquake
Messages) Dissemination
By Fax to Government’s Information Services Department and Radio Station
In Chinese (Traditional) and English Issued manually Normally issued later than Quick
Earthquake Messages, but still within 20 minutes after origin
Locally Felt Earth Tremor Reports
HKO’s Seismic Analyses Constraints
No 7/24 seismologist on duty Automation is the only way to go
HKO’s Parameters Results from Antelope, if automatically
verified against those from PTWC, NEIC or WCATWC
Differences in latitude and longitude <= 1.0 Difference in magnitude <= 0.5
Parameters from other sources if and when necessary
Automatic Seismic Information Webpage (for
duty officers)
Hong Kong Seismograph Network
Automatic Analysis for Near Events
(for duty officers)
Experimental Quick Earthquake Intensity (for
duty officers)
Experimental Quick Earthquake Intensity (for
duty officers)
Seismic data processing
systemHKPS, HKC and local 8 stationsIRIS Data Management Centre UC San Diego (UCSD)GEOFON (Mediterranean, NE Atlantic and Indian Ocean )
Global Seismographic Network (GSN)
M >= 6.0 Lat & lon <= 1 deg
XML MINDS
Strong Earthquake Report /QEM (Magnitude 6.0+ )Pacific Tsunami Warning Centre (PTWC)
National Earthquake Information Centre (NEIC)
West Coast and Alaska Tsunami Warning Center (WCATWC).
GEOFON ( planned to add )
EPICS
Automatic Seismic Information
HKO Seismic data processing system
HKO website, ISD, RTHK
Quick Earthquake Message QEM
1. Locally Felt Earth Tremor Report
2. Updated Earthquake Report with Intensity and Epicentre location map
Locally Felt Earth Tremor
OCGIO email to SMS services
Message Dissemination
system
XML
QEMQEMHKO Twitter & Weibo(In progress)
QEM
廣東省地震局 (EAGP)
中國地震局 (CEA)
NEIC if any
Locally felt earth tremor
HKO Twitter and Weibo (In progress)
HKO Seismic data processing system
QEM
MINDS
1. Locally Felt Earth Tremor Report
2. Earthquake Report with Intensity and Epicentre location map
Message Dissemination
system
XML
QEM
HKO website, ISD, RTHK
Experimental Quick Earthquake Intensity
Problem: Magnitude sometimes not
be calculated so quickly even other earthquake parameters such as location can be spotted by our system.
a large earthquake followed by frequent aftershocks
two or more earthquakes occur within short period of time
Solution: The magnitude and other
parameters were adopted from other centres such as PTWC, USGS
System upgrade (Long term)
(A) Total Number of Earthquake Reports (M>=6.0) issued from 31 May 2011 to 31 July 2011 is 36Earthquake Parameters (Magnitude, Location etc) adopted from:
HKO seismic data processing
system
Other centres (PTWC, USGS
etc)295 (75%) 95 (25%)
(B) Total Number of Earthquake (M>=5.0) analyzed by our system from 31 May 2011 to 31 July 2011 is 390
~ 10 times events more than Earthquake report issued.
Earthquake Parameters (Magnitude, Location etc) adopted from:
HKO seismic data processing
system
Other centres (PTWC, USGS
etc)21 (58%) 15 (42%)
Problems Slow magnitude computation when
there are multiple events IRIS DMC sometimes has extensive
data outage for days, already added UCSD and GEOFON as sources
dbarchive and dbnoise no longer works
Cannot compute focal mechanism for most events