IRIS DMC Data Center Measurement Stats

Read the description of method for details of how the measurments are conducted.

Last 24 hours (updated hourly):

Last 48 hours (updated hourly):

Last 7 days (updated daily):

Last 31 days (updated daily):

All time (updated daily):

Method

The IRIS DMC monitors the status FDSN data centers by requesting small amounts of time series data from their fdsnws-dataselect web service interfaces.

Measurement sites: 7 geographically dispersed sites independently send measurement requests to each monitored data center. Measurement sites include: IRIS DMC (Seattle, WA), IRIS ADC1 (Livermore, CA), UNAVCO (Boulder, CO), UCSD (San Diego, CA), LDEO (Palisades, NY), SED (Zurich, Switzerland), IRIS HQ (Washington DC).

Measurement interval: each measurement site sends a request every 5 minutes to each monitored data center.

Measurement results: all measurements are aggregated at the IRIS DMC into the following classifications:

UP - At least 3 measurements total and at least one of them was successful.
DOWN - At least 3 measurements total and all of them were unsuccessful.
No measurement - Less than 3 measurements are available.
The classification is biased towards indicating that a data center is UP. Partial measurement failures are not indicated in the aggregated results as a single positive measurement results in UP. Obviously, down time in-between the measurements are not recorded. On the other hand, when an aggregate result is DOWN it is a very strong indicator that the data center's service was unreachable by anyone.

Measurement details

Each measurement is a small time series request, specific to each data center. Theses are the requests used:

IRISDMC  - service.iris.edu/fdsnws/dataselect/1/query?network=IU&station=COLA&location=--&channel=BHZ&starttime=1997-08-09T00:00:00&endtime=1997-08-09T01:00:00
IRISADC1 - service.adc1.iris.edu/fdsnws/dataselect/1/query?network=IU&station=COLA&location=--&channel=BHZ&starttime=1997-08-09T00:00:00&endtime=1997-08-09T01:00:00
NCEDC    - service.ncedc.org/fdsnws/dataselect/1/query?network=BK&station=CMB&location=--&channel=BHZ&starttime=1997-08-09T00:00:00&endtime=1997-08-09T01:00:00
SCEDC    - service.scedc.caltech.edu/fdsnws/dataselect/1/query?network=CI&station=PAS&location=--&channel=BHZ&starttime=1999-08-09T00:00:00&endtime=1999-08-09T01:00:00
GEOFON   - geofon.gfz-potsdam.de/fdsnws/dataselect/1/query?network=GE&station=EIL&location=--&channel=BHZ&starttime=1997-08-09T00:00:00&endtime=1997-08-09T01:00:00
ORFEUS   - www.orfeus-eu.org/fdsnws/dataselect/1/query?network=NL&station=HGN&location=01&channel=BHZ&starttime=2007-08-09T00:00:00&endtime=2007-08-09T01:00:00
RESIF    - ws.resif.fr/fdsnws/dataselect/1/query?network=FR&station=RUSF&location=01&channel=BHZ&starttime=2012-08-09T00:00:00&endtime=2012-08-09T01:00:00
SED      - eida.ethz.ch/fdsnws/dataselect/1/query?network=CH&station=BNALP&location=--&channel=BHZ&starttime=2012-08-09T00:00:00&endtime=2012-08-09T01:00:00
INGV     - webservices.rm.ingv.it/fdsnws/dataselect/1/query?network=MN&station=AQU&location=--&channel=BHZ&starttime=1997-08-09T00:00:00&endtime=1997-08-09T01:00:00
BGR      - eida.bgr.de/fdsnws/dataselect/1/query?network=GR&station=MOX&location=--&channel=BHZ&starttime=2012-08-09T00:00:00&endtime=2012-08-09T01:00:00
LMU      - erde.geophysik.uni-muenchen.de/fdsnws/dataselect/1/query?network=BW&station=ROTZ&location=--&channel=EHZ&starttime=2012-08-09T00:00:00&endtime=2012-08-09T00:10:00
USPSC    - seisrequest.iag.usp.br/fdsnws/dataselect/1/query?network=BR&station=SALB&location=--&channel=HHZ&starttime=2012-08-09T00:00:00&endtime=2012-08-09T00:10:00
KOERI    - eida-service.koeri.boun.edu.tr/fdsnws/dataselect/1/query?network=KO&station=GADA&location=--&channel=BHZ&starttime=2012-08-09T00:00:00&endtime=2012-08-09T00:30:00
IPGP     - eida.ipgp.fr/fdsnws/dataselect/1/query?network=G&station=SSB&location=--&channel=BHZ&starttime=1997-08-09T00:00:00&endtime=1997-08-09T01:00:00
NIEP     - eida-sc3.infp.ro/fdsnws/dataselect/1/query?network=RO&station=BURAR&location=--&channel=BHZ&starttime=2012-08-09T00:00:00&endtime=2012-08-09T00:30:00
NOA      - eida.gein.noa.gr/fdsnws/dataselect/1/query?network=HL&station=ATH&location=--&channel=HHZ&starttime=2012-08-09T00:00:00&endtime=2012-08-09T00:10:00
ICGC     - ws.icgc.cat/fdsnws/dataselect/1/query?network=CA&station=CORG&location=--&channel=HHZ&starttime=2017-06-06T00:00:00&endtime=2017-06-06T00:10:00
RASPISHAKE - fdsnws.raspberryshakedata.com/fdsnws/dataselect/1/query?network=AM&station=R1992&location=00&channel=SHZ&startime=2017-10-12T00:00:00&endtime=2017-10-12T00:02:00