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DOE EGS Overview

2015/01/13 Please see note below about EGS catalog Geysers magnitude errors

In 2009 the US Department of Energy (USDOE) Geothermal Technologies Program began an Enhanced Geothermal Systems (EGS) project to investigate the process of enhancing high temperature geologic formations to provide commercial scale electric power generation.

As part of this effort, demonstration projects were initiated that were jointly funded by industry and DOE. One of the main components of the demonstration projects is to record local seismicity before during and after the injection of water into the hot rocks to provide information that may indicate the creation of permeable fractures as well provide information on the generation of any induced seismicity. Lawrence Berkeley National Labs Earth Sciences Division was funded to perform this EGS earthquake monitoring.

Current EGS sites include projects at:

The NCEDC is archiving both event and waveform data that is being generated from each of the DOE demonstration sites data and providing it to the public. For most EGS projects, data are sent from each station by spread spectrum radios (900 Mhz) to a central site. Each trigger is then sent to LBNL where it is processed. Lawrence Berkeley National Laboratory (LBNL) has the responsibility to collect the data, assemble event data from each of the sites to be archived (waveforms, locations, times metadata, etc) and transfer it to the NCEDC. The annual volume of data archived is expected to be on the order a terabyte per year from the 100,000 events per year.

You can get the EGS data at:

All archived EGS data from this project will be freely available to the public and research community through this site. In addition to this NCEDC web site LBNL maintains a public website that shows real time results in map form for each of the demonstration sites.

More information about the EGS project can be found at the LBLN EGS web site.

2015/01/13 Note about EGS catalog magnitude errors:

In reviewing Geysers data, the 4 events listed below had incorrect amplitudes from one station (DEB) that had a large amount of transient electronic noise. These amplitudes were previously included in the moment magnitude calculations for the events listed below, resulting in greatly exaggerated moment magnitude estimates. The corrected magnitude estimates, computed without the erroneous DEB amplitudes, are:

Date       Time              Lat        Lon   Depth   Mag Magt  Nst Gap  Clo  RMS  SRC   Event ID
2014/04/05 19:30:20.53  38.84790 -122.83538   2.543 0.43 (formerly 4.92)  ML    0   0    0 0.05 LBL    3383465
2014/04/05 19:52:57.37  38.84423 -122.82652   2.857 1.12 (formerly 4.87)  ML    0   0    0 0.01  LBL    3383466
2014/04/05 20:04:52.30  38.80133 -122.82338   1.035 0.45 (formerly 5.06)  ML    0   0    0 0.03  LBL    3383470
2014/04/07 01:18:36.17  38.83748 -122.78598   0.851 0.51 (formerly 4.65)  ML    0   0    0 0.04  LBL    3383663

Typical Station Equipment

GeophonesShort-period 3C geophones deployed at the surface (4.5 Hz OYO GS 11-D) or in 100 to 300 ft (8HZ 3C geophones)
DigitizerNanometrics Taurus (at 500 Samples / Sec)
TelemetrySpread spectrum radios (900 Mhz)
GPS receivers for time and location