scholarly journals Estimating earthquake source depths by combining surface wave amplitude spectra and teleseismic depth phase observations

2013 ◽  
Vol 194 (2) ◽  
pp. 1000-1010 ◽  
Author(s):  
Ross Heyburn ◽  
Neil D. Selby ◽  
Ben Fox
Keyword(s):  
Surface Wave ◽  
Wave Amplitude ◽  
Earthquake Source ◽  
Amplitude Spectra

The 4.6 mb,Lg Northeastern Kentucky Earthquake of September 7, 1988

1993 ◽  
Vol 64 (3-4) ◽  
pp. 187-199 ◽  
Author(s):  
R. Street ◽  
K. Taylor ◽  
D. Jones ◽  
J. Harris ◽  
G. Steiner ◽  
...  
Keyword(s):  
Surface Wave ◽  
Seismic Moment ◽  
Wave Amplitude ◽  
Linear Trend ◽  
Source Parameters ◽  
Strike Slip ◽  
Source Depth ◽  
Nodal Plane ◽  
Amplitude Spectra ◽  
Conjugate Fault

Abstract Source parameters for the September 7, 1988 northeastern Kentucky earthquake have been estimated from the analysis of surface-wave amplitude spectra. The source that best fits the observed data had a seismic moment of 2.0 × 1022 dyne-cm, a mechanism with strike = 198° ± 10°, dip = 51° ± 11°, and slip = −178° ± 17°, (T) trend = 160°, plunge = 25°, (P) trend = 55°, plunge = 28°, and source depth of 4 to 7 km. Thirty-two aftershocks were recorded during 2 weeks of monitoring following the mainshock; 23 of the aftershocks were locatable and fall on a roughly NW-SE linear trend. This trend is subparallel with the NW-SE nodal plane of the mainshock. Our analysis shows the 1988 event to be different from the July 27, 1980 mb,Lg = 5.3 earthquake located 11 km to the northwest. First, the 1988 event is considerably shallower (4 to 7 km) than the 1980 event (14 to 22 km). Second, data from the 1988 event suggest the motion is on a conjugate fault and is in contrast with the 1980 event, which had right-lateral strike-slip on a southeast-dipping plane.

Surface-Wave Amplitude Spectra

1972 ◽  
pp. 101-105
Author(s):  
V. I. Frantsuzova ◽  
A. L. Levshin ◽  
G. V. Shkadinskaya
Keyword(s):  
Surface Wave ◽  
Wave Amplitude ◽  
Amplitude Spectra

The Southeastern Illinois Earthquake of 10 June 1987

1989 ◽  
Vol 60 (3) ◽  
pp. 101-110 ◽  
Author(s):  
K. B. Taylor ◽  
R. B. Herrmann ◽  
M. W. Hamburger ◽  
G. L. Pavlis ◽  
A. Johnston ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Surface Wave ◽  
Seismic Moment ◽  
Wave Amplitude ◽  
Main Shock ◽  
Source Parameters ◽  
Focal Depth ◽  
Precambrian Basement ◽  
Amplitude Spectra ◽  
Best Fit

Abstract The June 10 southeastern Illinois earthquake was the 11th largest earthquake felt in the central U.S. during this century. Source parameters of the main shock were estimated from an analysis of surface-wave amplitude spectra. The source that best fit the observed data has focal depth of 10 ± 1 km; mechanism with strike= 40.6°± 5.9°, dip= 76.2° ± 5.6°, slip= 159.7° ± 6.0°; tension and pressure axes of (T) trend= 357°, plunge= 24°, (P) trend= 89°, plunge= 4°; and a seismic moment of 3.1 * 1023 dyne-cm. With the combined efforts of six institutions, a 24-station analog microearthquake network was deployed around the main shock epicenter. One hundred eighty-five aftershocks were recorded in the first week of monitoring, providing 144 hypocenter determinations. A subset of 51 well recorded events was used for joint relocation and calculation of station corrections for the stations within 100 km of the main shock epicenter. Joint hypocenter locations differ only slightly from the original locations. The spatial distribution of well located aftershocks indicates that the rupture was confined to a pencil-like zone within the Precambrian basement, extending from 7 to 11 km depth.

On the sound field generated by membrane surface waves on a wedge-shaped boundary

1987 ◽  
Vol 411 (1840) ◽  
pp. 239-250 ◽  
Keyword(s):  
Exact Solution ◽  
Surface Wave ◽  
Surface Waves ◽  
Wave Amplitude ◽  
Membrane Surface ◽  
Sound Field ◽  
Acute Angle ◽  
Rigid Surface ◽  
Arbitrary Angle ◽  
Method Of Solution

A semi-infinite membrane, joined to a rigid surface at an arbitrary angle, supports incident unattenuated surface waves. A compressible fluid is contained within the two semi-infinite boundaries and the resultant reflected surface-wave amplitude and the scattered acoustic field is sought. A method of solution is presented for wedge angles(2 p + 1) π/2 q , p and q integers, and the exact solution is obtained for an acute angle of ¼π.

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