In April of 2021, the U.S. Geological Survey conducted a high-resolution seismic survey at Mee Ranch in Monterey County, California. Both passive- and active-source seismic data were acquired using DTCC SmartSolo 3-component nodal seismograph systems ("nodes"), which continuously recorded data at rates up to 2000 samples per second. For passive-source acquisition, a 6x5 grid of nodes was deployed for several weeks before and during the active source shooting. For active-source acquisition, 395 nodes were deployed 1 meter apart (2 meters apart near the endpoints) along a southwest-northeast trend to create an approximately 500-m-long linear array. Additional nodes were deployed at 1 or 2 meter spacing along 25- and 50-m-long linear arrays centered about a known section of the fault. P-wave data were generated near each recording station of the main linear array using a Betsy seisgun firing an 8-gauge blank shotgun shell. P-wave data were also generated every 20 stations along the main linear array using approximately one/third pound of buried explosives. Fault-zone-guided-wave data were generated using explosive sources that were placed within a mapped trace of the San Andreas Fault zone and close to the shorter linear arrays. Finally, S-wave data were generated at each station using an aluminum block struck by a sledgehammer. Shot gathers were created in SEG-Y format (Barry et al, 1975) by extracting several seconds of data from each node for each recorded shot time. The passive grid data were converted to gain-corrected miniseed day files (Ahern and Dost, 2012). This report provides the metadata needed to analyze the seismic data.
Ahern, T. and Dost, B., 2012, Standard for the Exchange of Earthquake Data (SEED) Manual: International Federation of Digital Seismograph Networks Incorporated Research Institutions for Seismolog, version, 2.4.
Barry, K.M., Cavers, D.A., and Kneale, C.W., 1975, Recommended standards for digital tape formats: Geophysics, vol. 40, no.2, p.344-352.
|Title||High-resolution seismic imaging data acquired in 2021 across a trace of the San Andreas Fault at Mee Ranch, Monterey County, California|
|Authors||Mark R Goldman, Rufus D Catchings, Johanna M Nevitt, Joanne H Chan, Robert R Sickler, Coyn J Criley, Timothy J Clarke, Benjamin A Brooks, Todd L Ericksen|
|Product Type||Data Release|
|Record Source||USGS Digital Object Identifier Catalog|
|USGS Organization||Earthquake Hazards Program|