/raid/vol6/convert/976555/00001.tifNEW MADRID SEISMIC ZONE: 1975 - 1976
by
GRANT ENV 76-20875
DEPARTMENT OF EARTH AND ATMOSPHERIC SCIENCES SAINT LOUIS UNIVERSITY 221 NORTH GRAND BOULEV AIm ST. LOUIS, MO 63103
August, 1977
ANY OPINIONS, FINDINGS, AND CONCLUSIONS OR RECOMMENDATIONS EXPRESSED IN THIS PUBLICATION ARE THOSE OF THE AUTHOR AND DO NOT NECESSARILY REFLECT THE VIEWS OF THE NATIONAL SCIENCE FOUNDATION.
BIBLIOGRAPHIC DATA SHEET
11. Re p
orWS1= /RA-770309
4. Title and Subtitle Analysis of Strong Motion Data from the New Madrid Seismic Zone: 1975-1976
7. Author(s) R. B. Herrmann
9. Performing Organization Name and Address Saint Louis University Dept. of Earth and Atmospheric Sciences 221 North Grand Boulevard St. Louis, Missouri 63103 12. Sponsoring Organization Name and Address
Applied Science and Research Applications (ASRA) National Science Foundation 1800 G Street, N.W. Washinqton. D.C. 20550
1 S. Supplementary Notes
10. Project/Task/Work Unit No.
14.
This volume presents strong motion data from three earthquakes in the New Madrid Seismic Zone. One accelerograph was triggered by the mb= 4.2 June 13, 1975 event, seven were triggered by an mb=5.0 event on March 25, 1976, and one was triggered by an mb~4.5 aftershock on March 25, 1976. The strong motion data were processed using the computer programs developed at CALTECH. The raw digitized accelerograms, as well as the calculated ground acceleration, velocity and displacements are presented in tabular and graphic form.
17. Key Words and Document Analysis. 170. Descriptors
Earthquakes Earth movements Seismic waves Shock waves Seismographs Accelerometers
17b~ Identifiers/Open-Ended Terms
17c. COSATI Field/Group
18. Availability Statement
19." Security Class (This
Page UNCLASSIFIED
21. "No. of Pages
ATTENTION
AS NOTED IN THE NTIS ANNOUNCEMENTJ PORTIONS OF THIS REPORT ARE NOT LEGIBLE. HOWEVERJ IT IS THE BEST REPRODUCTION AVAILABLE FROM THE COpy SENT TO NTIS.
DIRECT QUESTIONS RESULTING FROM
NSF/RANN DOCUMENT CENTER NATIONAL SCIENCE FOUNDATION 1800 G STREETJ N.W. WASHINGTONJ D.C. 20550
ABSTRACT
This volume presents strong motion data from three earthquakes
in the New Madrid Seismic Zone. One acce1erograph was triggered by the
~=4.2 June 13, 1975 event, seven were triggered by an ~=5.0 event on
March 25, 1976 and one was triggered by an ~=4.5 aftershock on March 25, 1976.
The strong motion data were processed using the computer programs developed
at CALTECH. The raw digitized acce1erograms, as well as the calculated
ground acceleration, velocity and displacements are presented in tabular
and graphic form.
This volume represents an effort to disseminate strong motion
data obtained from three recent earthquakes in the New Madrid Seismic Zone.
It is felt that this information will be of use to engineers and others
concerned with aseismic design in eastern North America, because of the
present lack of strong motion data in the region. However, earthquakes
yielding strong motion data in eastern North America are infrequent. Thus,
these data should be used in conjunction with the worldwide strong motion
data base until more data are available to define the particular strong
motion characteristics of eastern North America. The only other strong motion
data for eastern North America in published literature occurred near Blue
Mountain Lake, New York and are described by Fletcher and Anderson (1974)
and Anderson and Fletcher (1976).
The approach taken in this report is to present as much detail
concerning the data as possible in order to facilitate its interpretation.
Thus information on the earthquake source parameters is provided. The
source parameters given are the most recent determinations. The processing
of the strong motion data was done using a version of the CALTECH computer
programs (Trifunac and Lee, 1973).
The computer output for each accelerogram trace consists of four parts:
1) a tabular listing of the raw digitized trace in units of (g/10),
uncorrected for DC offset, together with the natural period of the instrument
and fraction of critical damping; 2) a plot of the raw digitized trace;
3) a tabular listing of the instrument corrected ground acceleration, velocity
and displacement time histories found by applying the CALTECH program to
-2-
the results of phase 1; 4) plots of the ground acceleration, velocity
and displacement listed in phase 3. In performing the numerical integration,
the data were bandpass filtered between 0.07 and 25 Hz.
EARTHQUAKE SOURCE DATA
Earthquake of June 13, 1975 (001-003). This event was described
by Herrmann et al (1977). It was located at 36.53°N, 89.66°W at a depth
of 9 km. It occurred at 22:40:27.0 and had an mb=4-4.25. The event had
a seismic moment Mo=4.6 E 21 dyne-em, as determined from an analysis of long
period surface wave data and a corner frequency of about 1.6 Hz between the
low frequency fO and high frequency f-2 envelopes of the far-field body
wave source spectrum. The epicentral Modified Mercal!i intensity of this
event was VI (Carl Stover, NElS, personal communications). The nature of
faulting associated with this earthquake was such that one P wave nodal plane
had a strike of 85° an~ dip of 600 S, while the other had a strike of 185°
and a dip of 73°W. The sense of fault motion was right lateral motion on
the nodal plane striking 185° or equivalently left lateral on the nodal
plane striking 85°. Herrmann et al (1977) were able to model the displacement
pulses of records 001 and 003 very well using simple source theory.
Earthquake of March 25, 1976 (004-024). This event was located at
35.6°N and 90.5°W with a depth of 12 km. The origin time was 00:41:20.5 UTe
The event had an ~=5.0, a seismic moment Mo=l.2 E 23 dyne em, and a corner
frequency of 0.7 Hz. This event had a maximum epicentral intensity of VI
(C. Stover, personal communication). One nodal plane had a strike of 323°
and dip of 63°NE, while the other nodal plane had a strike of 40° and a dip
of 65°NW. The nature of P wave first motions is accounted for by right lateral
motion on the nodal plane striking 40°. This nodal plane is taken to be the
fault plane since it parallels a 100 km micro earthquake trend in the region
(Stauder ~ aI, 1976).
-3-
Earthquake of March 25, 1976 (025-027). This event was an aftershock
of the ~=5.0 event. The latitude, longitude and origin time were 35.6°N,
90.5°W and 01:00:11.9 UT, respectively. It had a depth of 14 km, an ~=4.5,
a seismic moment Mo =2.5 E 22 dyne-em, and an estimated corner frequency of
0.86 Hz. The focal mechanism solution for this earthquake indicates that
one nodal plane had a strike of 45° with a dip of 80 0 SE while the other had
a strike of 309° with a dip of 60 0 NE. The sense of P wave first motion is
given by right lateral faulting on the nodal plane striking 45°.
DISCUSSION
Of the twenty-seven traces processed, only records 001 and 003 admit
a simple interpretation because of the short epicentra1 distance to the event.
These two records indicate a distinct S arrival at about 0.4 seconds after
triggering. Herrmann ~ a1 (1977) were able to reconcile estimates of the
seismic moment and spectral characteristics of the source to the ground
displacements obtained from acce1erogram traces 001 and 003.
On the other hand records 004-027 are not as easily interpreted because
of the large distances of the acce1erographs from the source at these distances.
The observed arrivals are no longer simple pulses but are the result of
complicated interaction with the layered medium through which the waves
propagate. Besides thiS, the earth structure beneath the accelerographs is
not well known. With the exception of data from Wappapello Dam, MO., all
sites lie in the Mississippi embayment, the soil properties of which may
cause some site amplification.
Table 1 provides a summary of the data obtained from records 001-027.
This table provides station coordinates, distances and azimuths of each
station from the triggering source, site intensities and peak accelerations.
-4-
The nominal triggering threshold was 0.01 g vertical, even though some
accelerographs triggered at a lower level. Care was taken in digitizing
by following the center of the trace, so that it is felt that the low
acceleration traces are not too much in error, even though the trace width
was on the order of the maximum acceleration.
One last point should be made concerning another set of data, stations
which did not trigger. For the June 13, 1975 event stations 2446 at
Tiptonville, TN (28.6 km) and 2409 Poplar Bluff, MO, VA Hospital (73 km)
did not trigger. For the main event On March 25, 1976, Stations 2445
Sardis Dam, MS (147 km), 2409 Poplar Bluff, MO VA Hospital (130 km) and
2403 Cape Girardeau, MO (209 km) did not trigger. If the trigger level of
these stations can be ascertained, then these less than triggering
accelerations can be used to constrain any attenuation relations that might
be developed.
REFERENCES
Anderson, J.G. and J.B. Fletcher (1976). Source Properties of a Blue Mt. Earthquake, Bull. Seiam. Soc. Am. 66, 677-683.
Fletcher, J.B. and J.G. Anderson (1974). First strong motion records from a central or eastern United States earthquake, Bull. Seism. Soc. Am. 64, 1455-1465.
Herrmann, R.B., G.W. Fischer, and J.E. Zollweg (1977). The June 13, 1975 earthquake and its relationship to the New Madrid Seismic Zone, Bull. Seism. Soc. Am. 67, 209-218.
Stauder, W., M. Kramer, G. Fischer, S. Schaefer, and S.T. Morrissey (1976). Seismic characteristics of Southeast Missouri as indicated by a regional te1emetered micro earthquake array, Bull. Seism. Soc. Am. 66, 1953-1964.
Trifunac, M.D. and V. Lee (1973). Routine computer processing of strong­ motion acce1erograms, EERL 73-03, California Institute of Technology, Pasadena, California.
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