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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

Antelope Usage at Hong Kong Observatory

WOO Wang-chun



Hong kong po shan hkps a gsn affiliate station
Hong Kong Po Shan (HKPS)a GSN affiliate station

Po Shan Seismograph Station (HKPS)

Operational since 18 Feb 2010










Geophysical services of hong kong observatory
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
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 messages1
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 reports1
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



Hko s seismic analyses
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







Seismic data processing system

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 )


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


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)


  • 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)


(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:


Problems
Problems 31 May 2011 to 31 July 2011 is 36

  • 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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