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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.

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Antelope Usage at Hong Kong Observatory

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  1. Antelope Usage at Hong Kong Observatory WOO Wang-chun

  2. Global Seismographic Network

  3. Hong Kong Po Shan (HKPS)a GSN affiliate station Po Shan Seismograph Station (HKPS) Operational since 18 Feb 2010

  4. HKPS (Side View)

  5. HKPS (Top View)

  6. As-built Plan of the Seismic Chamber

  7. As-built Plan of the Plinths

  8. Master Network Diagram

  9. Geodetic Survey

  10. dbnoise of HKPS

  11. HKPS on IRIS DMC

  12. 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

  13. 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

  14. Quick Earthquake Messages

  15. 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

  16. Strong Earthquake Reports

  17. 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

  18. Locally Felt Earth Tremor Reports

  19. 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

  20. Automatic Seismic Information Webpage (for duty officers)

  21. Hong Kong Seismograph Network

  22. Automatic Analysis for Near Events(for duty officers)

  23. Experimental Quick Earthquake Intensity (for duty officers)

  24. Experimental Quick Earthquake Intensity (for duty officers)

  25. Global Seismographic Network (GSN) Seismic data processing system HKPS, HKC and local 8 stations IRIS Data Management Centre UC San Diego (UCSD) GEOFON (Mediterranean, NE Atlantic and Indian Ocean )

  26. 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 ) Automatic Seismic Information M >= 6.0 Lat & lon <= 1 deg XML MINDS Locally Felt Earth Tremor Quick Earthquake Message QEM HKO Seismic data processing system EPICS 1.Locally Felt Earth Tremor Report 2. Updated Earthquake Report with Intensity and Epicentre location map XML HKO website, ISD, RTHK Message Dissemination system QEM QEM QEM HKO Twitter & Weibo (In progress) OCGIO email to SMS services

  27. Locally felt earth tremor Experimental Quick Earthquake Intensity HKO Seismic data processing system MINDS 廣東省地震局 (EAGP) 中國地震局 (CEA) NEIC if any 1.Locally Felt Earth Tremor Report 2. Earthquake Report with Intensity and Epicentre location map HKO website, ISD, RTHK XML Message Dissemination system QEM QEM HKO Twitter and Weibo (In progress)

  28. 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 shortperiod of time • Solution: • The magnitude and other parameters were adopted from other centres such as PTWC, USGS • System upgrade (Long term)

  29. (A) Total Number of Earthquake Reports (M>=6.0) issued from 31 May 2011 to 31 July 2011 is 36 Earthquake Parameters (Magnitude, Location etc) adopted from: (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:

  30. 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

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