About the SCEDC
Archive
Waveform Archival Policies for SCSN Stations
Description
The waveform archival policies of the Southern California Earthquake Data Center have evolved with advances in the Southern California Seismic Network instrumentation as well as advances in cpu and disk storage. This page provides a general overview.
Continuous Archival
| sample rate (sps) | response range | gain | SEED channel | start date of archival |
| 100 | high broadband | high | HH* | 2008/01/01 |
| 80 or 100 | high broadband | accelerometer | HN* or HL* | 2010/01/01 |
| 100 | extremely short period | high | EH* | 2008/01/01 |
| 50 | short period | high | SH* | 2008/01/01 |
| 20 or 40 | broadband | high | BH* | 1999/01/01 |
| 10 | long period | high | LH* | 1999/09/01 |
| 1 | very long period | high | VH* | 1999/09/01 |
Triggered Archival
| 5.0 <= Mx<= 5.5 | 6 hours before the event and 6 hours after |
| 5.5 <= Mx<= 6.0 | 6 hours before the event and 12 hours after |
| 6.0 <= Mx | 12 hours before the event and 24 hours after |
Significant Event Continuous Recording 2002-2006
In the past certain seismic channels were only archived as triggered events. However, when a significant event occured, the SCEDC would archive and distribute large, continuous time-windows of high sample-rate data (H__ and E__ channels) for a few hours before and after the event. This procedure became unnecessary when the SCEDC began continuous archival of all seismic channels.
The general guidelines for significant-event snapshot data collection were:
| sample rate (sps) | response range | gain | SEED channel | start date of archival |
| 80 or 100 | extremely short period | high gain | EH* | 1977/01/01 |
| 80 or 100 | extremely short period | low gain | EL* | 1977/05/01 |
| 80 or 100 | high broad band | high gain | HH* | 1993/05/01 |
| 20 or 40 | high broad band | high gain | BH* | 1990/09/01 |
Access
These data are considered part of the continuous archive, rather than the triggered archive. To check on the availability of data for a particular event, use the 'avail' command in STP. For example, for the 2003/02/22,12:19:00 Big Bear event, use:
STP> avail -l -chan HH_ 2003/02/22,06:00:00 +18h
to determine what records are available for 6 hours before the event to 12 hours after.
To retrieve the data, use the 'WIN' command in STP:
STP> win -chan HH_ 2003/02/22,06:00:00 +18h (or any sub-portion of time).
Events Available
We have continuous snapshots available for the following events:
| 0.7 mi S of Obsidian Butte, CA | evid: 14179736 | Mag = 5.1 |
|---|---|---|
| Origin date/time: | 2005/09/02 | 01:27:19 |
| lat/long | 33.1598 | -115.6370 |
| 0.8 mi SSE of Obsidian Butte, CA | evid: 14178184 | Mag = 4.6 |
| Origindate/time: | 2005/08/31 | 22:47:45 |
| lat/long | 33.1648 | -115.6357 |
| channels/time available: | HH_, HL_, EH_ | Continuous archive from 2005/08/31,00:00:00 to 2005/09/06,00:00:00 |
| 5.6 mi ESE of Anza, CA | evid: 14151344 | Mag = 5.2 |
| Origin date/time: | 2005/06/12 | 15:41:46 |
| lat/long | 33.5288 | -116.5727 |
| 2.1 mi NE of Yucaipa, CA | evid: 14155260 | Mag = 4.9 |
| Origin date/time: | 2005/06/16 | 20:53:2 |
| lat/long | 34.058 | -117.0113 |
| channels/time available: | HH_, HL_, EH_ | Continuous archive from 2005/06/12,12:00:00 to 2005/06/18,00:00:00 |
| 13.4 mi W of Wheeler Ridge | evid: 14138080 | Mag = 5.2 |
| Origin date/time: | 2005/04/16 | 19:18:13 |
| lat/long | 35.0272 | -119.1783 |
| channels/time available: | HH_, HL_ | -6h, +12h |
| Sumatra-Andaman Island Earthquake | evid: 10069653 | Mw = 9.0 |
| Origin date/time: | 2004/12/26 | 00:58:50 |
| lat/long | 3.307 | 95.947 |
| channels/time available: | HH_, EH_ | -0.5h, +5.5h |
| 2004 Parkfield Earthquake | evid: NC.51147892 | Mag = 6.0 |
| Origin date/time: | 2004/09/28 | 17:15:24 |
| lat/long | 35.815 | -120.374 |
| channels/time available: | HH_, HL_, EH_, EL | -6h, +12h |
| Adobe Hills Swarm (east of Mono Lake) | evid: NC.51146343 | Mag = 5.5 |
| Origin date/time: | 2004/09/18 | 23:02:17 |
| lat/long | 38.009 | -118.679 |
| channels/time available: | HH_, HL_, EH_, EL | -6h, +12h |
| stations archived: | All stations within 500km radius of origin | |
| Offshore: 42 mi SE of San Clemente Island, CA | evid: 14065544 | Mag = 5.3 |
| Origin date/time: | 2004/06/15 | 22:28:48 |
| lat/long | 32.3287 | -117.9175 |
| channels/time available: | HH_, HL_, EH_, EL | -3.5h, +3.5h |
| Wheeler Ridge, CA | evid: 9983429 | Mag = 4.3 |
| Origin date/time: | 2004/02/14 | 12:43:11 |
| lat/long | 35.0378 | -119.1312 |
| channels/time available: | HH_,EH_ | -2h, +22h |
| San Simeon, CA | evid: 9966449 | Mag = 6.5 |
| Origin date/time: | 2003/12/22 | 19:15:56 |
| lat/long | 35.7085 | -121.1043 |
| channels/time available: | HH_,HL_, EH_, EL_ | -6h, +12h |
| Hokkaido, Japan | evid: 13993864 | Mag = 8.3 |
| Origin date/time: | 2003/09/25 | 19:50:08 |
| lat/long | 41.8150 | 143.9100 |
| channels/time available: | EH_, EL_ | -12h, +12h |
| Big Bear | evid: 13935988 | Mag = 5.4 |
| Origin date/time: | 2003/02/22 | 12:19:10 |
| lat/long | 34.3098 | -116.8480 |
| channels available: | HH_,HL_, EH_, EL_ | -6h, +12h |
| Yorba Linda | evid: 9818433 | Mag = 4.8 |
| Origin date/time: | 2002/09/03 | 07:08:51 |
| lat/long | 33.9173 | -117.7758 |
| channels available: | HH_, HL_ | -6h, +24h |
