Commerce Geophysical Lineament, MO – 1996 & 1997
Seismic reflection data were acquired on six profiles.
Profile CGL-1 (1996) is approximately 3.68 miles (5.9km) long. The first portion of the profile begins at
the intersection of Butler County roads 688 and 673 (N 36.606394°, W 90.211382°), northeast of Qulin,
and goes south approximately 3.19 miles (5.13km). The second portion of the profile begins
approximately 220 feet (67m) south of CR-688 and CR-673, overlapping the first portion, and goes north
to approximately 0.5 mi. (0.8km) north of CR-688. Source is a 10-pound (4.5kg) sledge hammer.
Receivers are 28 Hz vertical geophones, 3 geophones in cluster array per group. Source and receiver
spacing is 20 feet (6.1m). Field records are 48 channels nominally. Sample interval is 1ms. Record
length is 1.024s. The source started at the first station of each 48-channel spread, the spread was then
held constant as the source was walked onto the array for the first 24 stations. The spread was then
moved forward 24 stations and the pattern repeated.
Profile IDAL-1 (1997) is approximately 1.5km long. The profile starts at approximately N 36.902274°, W
89.820055° on state road AB, crosses state road N to the east, and ends at approximately N 36.902851°,
W 89.803492°. The source is 3 gasoline powered earth tampers operated in a pseudo-random fashion.
Source spacing is 5m. Receivers are 28Hz vertical geophones, 3 geophones in cluster array per group.
Receiver spacing is 5m. The sample interval is 1ms and the record length is 1.024s. Four records were
recorded, correlated, and stacked at each shot point. Field records are 60 channels nominally. A 60Hz
notch filter was applied during acquisition.
Profile IDAL-2 (1997) is approximately 1.65km long. The profile starts at approximately N 36.874121°, W
89.869971°, the intersection of state roads E and 541. The profile goes east to the intersection of state
roads E and 565, N 36.870260°, W 89.852071°. The source, receiver, and recording parameters are
identical to Profile IDLA-1.
Profile ALB-1 (1997) is approximately 1.16km long. The profile starts at approximately N 37.181500°, W
89.464841° and goes south and southeast along state road 321, ending approximately N 37.173020°, W
89.459539°. Source is a 12 gauge seismic shotgun fired vertically into a shallow hole. Receivers are
28Hz vertical geophones, 3 per group. Source and receiver spacing is 3m. The sample interval is 0.5ms.
The record length is 1.024s. Field records are 60 channels nominally. A 60Hz notch filter was applied
during acquisition.
Profile ALB-2 (1997) is approximately 447m long. The profile starts approximately N 37.161426, W
89.450152, and goes south along the unpaved road to approximately N37.157840, W 89.448750. The
source, receiver, and recording parameters are identical to Profile ALB-1.
Profile ALB-3 (1997) is approximately 537m long. The profile starts approximately N 37.159511, W
89.451008 and goes east along the unpaved road to approximately N37.162385, W 89.446801. The
source, receiver, and recording parameters are identical to Profile ALB-1.
If these data are used for a presentation or in a publication, please acknowledge the U.S. Geological
Survey and the National Earthquake Hazards Reduction Program for their acquisition.
Publications:
An example of neotectonism in a continental interior – Thebes Gap, Midcontinent, United States,
Richard W. Harrison, David Hoffman, James D. Vaugh, James R. Palmer, Christine L. Wiscombe, John P.
McGeehin, William J. Stephenson, Jack K. Odum, Robert A. Williams, Steven L. Forman, Tectonophysics
v. 305 (1999) 399-417.
Deformation and Quaternary Faulting in Southeast Missouri across the Commerce Geophysical
Lineament, W. J. Stephenson, J. K. Odum, R. A. Williams, T. L. Pratt, R. W. Harrison, and D. Hoffman,
Bulletin of the Seismological Society of America, v. 89, n. 1, (1999) 140-155.