CTBTO Link to the ISC Database

Transcription

1 CTBTO Link to the ISC Database Dmitry A. Storchak, Kostas Lentas, James Harris International Seismological Centre (ISC) June 24, 2015 S&T, CTBTO, Vienna 1

2 International Seismological Centre (ISC): Intro Thanks to the international and non-governmental status, the ISC is now able to collect seismic bulletins from 137 agencies worldwide, including JMA, USGS, USArray and IDC / CTBTO June 24, 2015 S&T, CTBTO, Vienna 2

3 International Seismological Centre (ISC): Intro Jointly with USGS, the ISC runs the International Seismographic Station Registry By 2015, a total of ~21,500 stations were registered; ~7,500 of them contributed to the 2012 ISC Bulletin. June 24, 2015 S&T, CTBTO, Vienna 3

4 International Seismological Centre (ISC): Intro Global long-term definitive Seismic Bulletin ( ) ~5.7 M events, ~1.9 M of them are reviewed; ~141 M seismic arrivals from ~15,900 stations June 24, 2015 S&T, CTBTO, Vienna 4

5 International Seismological Centre (ISC): Intro Seismic arrays and stations of IMS Arrays and stations reporting to ISC Number of stations that contributed to the location of events common to REB and ISC bulletins June 24, 2015 S&T, CTBTO, Vienna 5

6 International Seismological Centre (ISC): Intro 100,000 Number of events 10,000 1, NEIC IDC ISC Comparative magnitude completeness of the three global bulletins magnitude June 24, 2015 S&T, CTBTO, Vienna 6

7 International Seismological Centre (ISC): Intro IASPEI Reference Event List (GT) ,573 GT(0-5) events with locations known with 95% confidence level: ü natural ü anthropogenic accompanied by ~870,000 associated seismic arrivals June 24, 2015 S&T, CTBTO, Vienna 7

8 CTBTO Link to the ISC Database: Intro The Link is a service provided to NDCs and PTS from the secure IDC website. The ISC designs, implements and maintains this service in consultation with the IDC. The Link is funded and technically assisted by CTBTO. June 24, 2015 S&T, CTBTO, Vienna 8

9 CTBTO Link to the ISC Database: Objectives Provide specifically designed web tools to access ISC datasets: Allow flexible event re-location using REB and ISC data ISC Bulletin; Station Registry EHB Bulletin; GT-List (Ground Truth). Assist in preparing waveform requests to non-ctbto waveform archives with respect to REB and GT events. Give a historical perspective into current IMS observations based on the wealth of non-ims recordings over the last years. June 24, 2015 S&T, CTBTO, Vienna 9

10 The Link: secure IDC website, where to find click on Civil & Scientific click on Links June 24, 2015 S&T, CTBTO, Vienna 10

11 The Link: Overview of searches Four groups of searches: Area based spatio-temporal searches within the ISC Bulletin; REB event based spatiotemporal searches based on specific events within the IDC Reviewed Event Bulletin; IMS station based searches of station data proximate to a particular IMS seismic station. GT event based searches for GT event waveform records. June 24, 2015 S&T, CTBTO, Vienna 11

12 The Link: Convenient interactive web service Interactive Google Maps based interface; One of the most flexible and sophisticated interactive tools available to the seismological community; Searches can be completed across multiple meridians; Highly customised shapes unavailable on any other seismological site. Customised overlays: Plate boundaries; Seismicity (with clickable data); Station markers (with clickable data). June 24, 2015 S&T, CTBTO, Vienna 12

13 The Link, Example 1: Event types 5 categories of events to choose Korea region, to Sortable columns Links to a full Bulletin for a selected event 4 event types to choose June 24, 2015 S&T, CTBTO, Vienna 13

14 The Link, Example 2: Reporting networks Korea Region All networks reporting events are listed For each network: o o timelines of the event numbers, frequency-magnitude distributions June 24, 2015 S&T, CTBTO, Vienna 14

15 The Link, Example 3: Missing stations Based on the selected REB event: Stations reporting for other events within the magnitude tolerance AND the selected REB event Stations reporting for events within the magnitude tolerance yet NOT the selected REB event June 24, 2015 S&T, CTBTO, Vienna 15

16 The Link, Ex. 4: Station features IMS station based: e.g. pre-ims history of WRA Median residual Observa.ons Year Median residual Observa.ons IMS upgrade The station search also provides historic data for stations before they became part of the IMS network or stations that were operated for many years close to current IMS sites. Arrival.me residual Year distance June 24, 2015 S&T, CTBTO, Vienna 16

17 Link, Ex. 5: REB: non-ims waveform preview & request Select an area and a time period Closest stations to the event in Peru, Apr 01, 2015, 16:45 Select an REB event Waveform previews for individual stations with close range view showing raw and prefiltered waveform Web form for ordering waveforms from: IRIS DMC, GeoNet (GNS) EIDA (ORFEUS) June 24, 2015 S&T, CTBTO, Vienna 17

18 The Link, Ex. 6: ISC-style web location for REB events Same event in Peru, As usual, the ISC will compute, review and publish its hypocenter and magnitude solution only in 2 years time when all possible arrival times have been collected from ~137 institutions worldwide. In the mean time, there are hundreds of arrival times from IMS and non-ims stations already available in the ISC db. Using the Link, users can compute an ISC-style location, having selected which seismic stations/phases are to be used as defining. The result can be obtained almost instantaneously using an advantage of the ISC Locator accustomed for nonuniformly distributed seismic networks. IMS formatted output is ready to be used for further analysis. June 24, 2015 S&T, CTBTO, Vienna 18

19 The Link, Ex. 7: GT events: waveform preview & download We collected waveforms of GT events for the period from IRIS DMC and EIDA. We are planning to collect all available waveforms from many other archives for the entire digital period: 1980-present. Having selected a specific GT event, user can preview original and pre-filtered waveform snippets as well as download all waveforms for this event to their computer. June 24, 2015 S&T, CTBTO, Vienna 19

20 The Link: Current Use Statistics of the Link s use by the PTS and NDCs June 24, 2015 S&T, CTBTO, Vienna 20

21 The Link: Acknowledgements funding, providing REB, connecting to NDCs, and development advice To 63 Member-Institutions and 137 bulletin providers crucial start-up funding and current support stable, convenient and open access to seismic waveform records excellent open software June 24, 2015 S&T, CTBTO, Vienna 21

22 The Link: Summary u u u The CTBTO Link to the ISC database is an exclusive service funded by the IDC/CTBTO, provided by the ISC, used by NDCs and PTS. The Link gives a historical perspective into current IMS observations based on the wealth of non-ims recordings over years. The ISC continues further improvement of the Link under the new Contract. June 24, 2015 S&T, CTBTO, Vienna 22