SAFOD - 1st Anniversary

April 2009

Güralp Systems Ltd.'s deep borehole sensor in the San Andreas Fault Observatory at Depth (SAFOD) has recently reached a major milestone. It has been one year since the sensor was installed at a depth of approximately 1,050m near the small town of Parkfield in California, half way between San Francisco and Los Angeles. The system has been transmitting real time data flawlessly ever since.

The downhole package consists of:

CMG-3TB very broadband (VBB) velocity sensor with response from 360s to 100Hz;
CMG-5TB strong motion sensor with response from DC to 400Hz;
CMG-DM24mk3 7-channel 24-bit downhole digitiser with serial to optical converter; and
Single jaw hole lock.

The installation is part of a collaborative experiment with the principal investigators of the SAFOD project, one of the three components of the U.S. National Science Foundation's Earthscope program.

The sensor package, along with the digitiser, are both deployed in the pilot hole. The digitiser is transmitting nine data streams from the sensors: six VBB velocity data channels sampled at 1 and 200sps respectively, as well as the three accelerometer channels sampled at 200sps. The data are part of the SAFOD data mix and are available to researchers through the IRIS Data Center or the Berkeley Seismological Laboratory of the University of California, Berkeley. For more information on the SAFOD project, please visit the project homepage.

GSL personnel reported the first results from the experiment at the recent annual meeting of the Seismological Society of America, held in Monterey, California. The slides from their presentation are shown below.

Güralp Systems Ltd. has been building seismometers for deep boreholes since the founding of the company in 1985. The first such instrument was delivered to Japan in the late 1980s and deployed by the crew of RV Joides Resolution at 714m in ODP hole 794 in the Sea of Japan. Since then university researchers, governmental organisations in several countries as well as an international organization have purchased seismic sensors from Güralp Systems for their boreholes. The recent milestone underscores GSL's position as one of the world's foremost suppliers of seismic sensors for all kinds of applications.

Slides from the Güralp Systems Ltd. presentation

Click slide to advance...

SAFOD schematic (thumb.jpg) courtesy of the U. S. Geological Survey.



Home Products Borehole CMG-3TB CMG-5TB CMG-40TB CMG-3T5TB Accessories Featured Articles OBS CMG-3TOBS CMG-40TOBS Accessories Featured Articles Digitisers CMG-DM24 CMG-DM24S3DCM CMG-DM24S6DCM CMG-DM24S12AMS Accelerometers Analogue CMG-5TC CMG-5T CMG-5U CMG-55T Digital CMG-5TD Broadband Seismometers Weak Motion Analogue CMG-3T, 3V CMG-3ESP, 3ESPV CMG-3ESPC Digital CMG-3TD CMG-3ESPD CMG-3ESPCD Medium Motion Analogue CMG-6T, 6V, 6H CMG-40T, 40V, 40H Digital CMG-6TD CMG-40TD CMG-EDU Strong Motion Analogue CMG-5TC CMG-5T CMG-5U CMG-55T Digital CMG-5TD Data Modules CMG-EAM CMG - Serial Server Accessories CMG-GPS Control Units Borehole Accessories OBS Accessories Removable Disks Software Scream! Firmware Updates Product Support "How-to" guides Manuals & Documentation Applications Services Installations Running a Station Training Courses Support Manuals Firmware Updates Calibration How-to Guides Set-up Guides Software Service Centres Technical Support About Us Company Profile Contact Us Distributors Find Us Vacancies News Quality Statement Case Studies	Printable version SAFOD - 1st Anniversary April 2009 Güralp Systems Ltd.'s deep borehole sensor in the San Andreas Fault Observatory at Depth (SAFOD) has recently reached a major milestone. It has been one year since the sensor was installed at a depth of approximately 1,050m near the small town of Parkfield in California, half way between San Francisco and Los Angeles. The system has been transmitting real time data flawlessly ever since. The downhole package consists of: CMG-3TB very broadband (VBB) velocity sensor with response from 360s to 100Hz; CMG-5TB strong motion sensor with response from DC to 400Hz; CMG-DM24mk3 7-channel 24-bit downhole digitiser with serial to optical converter; and Single jaw hole lock. The installation is part of a collaborative experiment with the principal investigators of the SAFOD project, one of the three components of the U.S. National Science Foundation's Earthscope program. The sensor package, along with the digitiser, are both deployed in the pilot hole. The digitiser is transmitting nine data streams from the sensors: six VBB velocity data channels sampled at 1 and 200sps respectively, as well as the three accelerometer channels sampled at 200sps. The data are part of the SAFOD data mix and are available to researchers through the IRIS Data Center or the Berkeley Seismological Laboratory of the University of California, Berkeley. For more information on the SAFOD project, please visit the project homepage. GSL personnel reported the first results from the experiment at the recent annual meeting of the Seismological Society of America, held in Monterey, California. The slides from their presentation are shown below. Güralp Systems Ltd. has been building seismometers for deep boreholes since the founding of the company in 1985. The first such instrument was delivered to Japan in the late 1980s and deployed by the crew of RV Joides Resolution at 714m in ODP hole 794 in the Sea of Japan. Since then university researchers, governmental organisations in several countries as well as an international organization have purchased seismic sensors from Güralp Systems for their boreholes. The recent milestone underscores GSL's position as one of the world's foremost suppliers of seismic sensors for all kinds of applications. Slides from the Güralp Systems Ltd. presentation Click slide to advance... SAFOD schematic (thumb.jpg) courtesy of the U. S. Geological Survey.