Name/Title
S10.12.010Description
A shear wave analysis study done by the Indiana Geological Survey. The study was to profile seismic shear velocity along the vertical extent of water observation wells for an earthquake susceptibility profile to determine liquification potential in the area studied. The seismic shear was measured at water observation wells around Ohio. Donald L. Eggert of the Indiana Geological Survey is shown holding the geophone attached to a packer with inflator and sensor cable ready to be dropped down the well casing in the foreground of the image. The water observation wells had logs of glacial material sediment, which made them particularly good locations for the study. The water observation well location pictured is in Preble County, Ohio. The image was made by Michael C. Hansen in 1997.
REVIEW
From an e-mail exchange between Michael C. Hansen and Lisa F. Long on 9 August 2016: Hi Lisa, It was part of the Indiana Survey project to asses earthquake risk and western Ohio was included because of the Anna seismic zone in western OH. The fellow with glasses and the tan T-shirt is Don Eggert with the Indiana Survey. The remainder of the people were with Indiana but I don’t know their names. This was part of a project the IN Survey was doing to determine shear wave velocities in glacial materials and they invited me to observe the Ohio locations. They did a number in Indiana as well. This is before the Ohio Survey began work of this type. The locations coincided with nearby water wells that had good logs of the sediments.--Mike
This slide image included in the USGS National Digital Catalog for NGGDPP Grant G15AP00115 in FY2015.Context
Woman holding small pipe piece with wire attached; man standing next to her. Preble County, Ohio.