Southern California Earthquake Data Center

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

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


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:

 

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

 

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
Fontana Swarm evid: 14116972 Mag = 4.4
Origin date/time: 2005/01/06 14:35:28
lat/long 34.1250 -117.4387
channels/time available: HH_, HL_, EH_ -2.5h, +21.5h
stations archived: All stations within 50km radius of origin
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

 

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