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Passive seismic (HVSR) data from Fountain Creek, CO

January 14, 2022

A total of 119 passive seismic soundings were collected with Tromino (MoHo s.r.l.) 3-axis seismometers in the Fountain Creek area to partially refine alluvial aquifer thickness (depth to bedrock) estimates, particularly over known or suspected paleochannels. Data were collected during June 21-24, 2021 with a team of 4-5 people, each equipped with a Tromino Blu or Tromino 3G passive seismometer. A subset of the data included measurements made for shear velocity calibration; this included data collected at 10 well sites where depth to bedrock was available from driller's logs, and 3 sites above cutbanks where bedrock outcropped and the thickness of alluvial sediments could be directly measured. Data were processed using a publicly available batch R processing script (Terry, 2022).

In picking depths from the 119 measurements for alluvial aquifer thickness, roughly 30% were deemed unusable, 14% were picked with low confidence, 38% were picked with medium confidence, and 18% were picked with high confidence. Calibration data suggested a shear wave velocity of 195 meters per second. Using this value, estimated alluvial aquifer thicknesses ranged from 1.7 to 26.8 meters.

Publication Year 2022
Title Passive seismic (HVSR) data from Fountain Creek, CO
DOI 10.5066/P9H3D9JG
Authors Neil C Terry, Cory A Russell, Micah Morris, Connor P Newman, M. Alisa Mast, Suzanne Paschke
Product Type Data Release
Record Source USGS Digital Object Identifier Catalog
USGS Organization New York Water Science Center