A comment on “An optimal strategy for searching the best fault-plane solution using wave-amplitude data” by Kailash Khattri

1978 ◽  
Vol 68 (5) ◽  
pp. 1539-1539
Author(s):  
H. Jarosch
Keyword(s):  
Optimal Strategy ◽  
Wave Amplitude ◽  
Fault Plane ◽  
Fault Plane Solution ◽  
Amplitude Data ◽  
Plane Solution

An optimal strategy for searching the best fault-plane solution using wave-amplitude data

1977 ◽  
Vol 67 (5) ◽  
pp. 1355-1362
Author(s):  
Kailash Khattri
Keyword(s):  
Seismic Waves ◽  
Fault Plane ◽  
Source Parameters ◽  
P Wave ◽  
Spectral Amplitude ◽  
Fault Plane Solution ◽  
Amplitude Data ◽  
Earthquake Source Parameters ◽  
Plane Solution ◽  
Deep Focus

abstract This paper presents an optimum search procedure known as the Fibonacci Technique for abstracting the earthquake-source parameters from the amplitude data of seismic waves. The power of the method has been demonstrated by determining the fault-plane solution of a deep-focus earthquake using the P-wave spectral amplitude data.

The San Salvador Earthquake of October 10, 1986—Seismological Aspects and Other Recent Local Seismicity

1987 ◽  
Vol 3 (3) ◽  
pp. 419-434 ◽  
Author(s):  
Randall A. White ◽  
David H. Harlow ◽  
Salvador Alvarez
Keyword(s):  
Main Shock ◽  
Fault Plane ◽  
Vertical Plane ◽  
Aftershock Sequence ◽  
Central American ◽  
Fault Plane Solution ◽  
San Salvador ◽  
The North ◽  
Volcanic Chain ◽  
Plane Solution

The San Salvador earthquake of October 10, 1986 originated along the Central American volcanic chain within the upper crust of the Caribbean Plate. Results from a local seismograph network show a tectonic style main shock-aftershock sequence, with a magnitude, Mw, 5.6. The hypocenter was located 7.3 km below the south edge of San Salvador. The main shock ruptured along a nearly vertical plane toward the north-northeast. A main shock fault-plane solution shows a nearly vertical fault plane striking N32\sz\E, with left-lateral sense of motion. This earthquake is the second Central American volcanic chain earthquake documented with left-lateral slip on a fault perpendicular to the volcanic chain. During the 2 1/2 years preceeding the earthquake, minor microseismicity was noted near the epicenter, but we show that this has been common along the volcanic chain since at least 1953. San Salvador was previously damaged by a volcanic chain earthquake on May 3, 1965. The locations of six foreshocks preceding the 1965 shock show a distinctly WNW-trending distribution. This observation, together with the distribution of damage and a fault-plane solution, suggest that right-lateral slip occurred along a fault sub-parallel with Central American volcanic chain. We believe this is the first time such motion has been documented along the volcanic chain. This earthquake was also unusual in that it was preceded by a foreshock sequence more energetic than the aftershock sequence. Earlier this century, on June 08, 1917, an Ms 6.4 earthquake occurred 30 to 40 km west of San Salvador Volcano. Only 30 minutes later, an Ms 6.3 earthquake occurred, centered at the volcano, and about 35 minutes later the volcano erupted. In 1919 an Ms 6 earthquake occurred, centered at about the epicenter of the 1986 earthquake. We conclude that the volcanic chain is seismically very active with variable styles of seismicity.

The Chelmsford-Lowell, Massachusetts, earthquake of 23 November 1980: Depth control and fault plane solution

1981 ◽  
Vol 71 (4) ◽  
pp. 1369-1372
Author(s):  
Jay J. Pulli ◽  
Michael J. Guenette
Keyword(s):  
New England ◽  
Fault Plane ◽  
Seismic Station ◽  
Focal Depth ◽  
Strike Slip ◽  
Fault Plane Solution ◽  
Origin Time ◽  
Small Magnitude ◽  
Depth Control ◽  
Plane Solution

abstract On 23 November 1980, a small (magnitude 2.9) earthquake occurred on the Chelmsford-Lowell, Massachusetts, border, approximately 10 km northeast of the MIT seismic station at Westford, Massachusetts (WFM). Thus we were able to accurately determine the focal depth, which is generally not the case in New England. Our hypocentral solution was latitude 41.63, longitude −71.36, depth 1.5 km, at origin time 00:39:32.0 UTC. The fault plane solution shows either strike-slip or dip-slip faulting with a P axis trending NE-SW, which is in agreement with overcoring measurements in a nearby granite quarry.

A study of the Koyna earthquake of December 10, 1967

1969 ◽  
Vol 59 (3) ◽  
pp. 1149-1162
Author(s):  
Harsh Gupta ◽  
Hari Narain ◽  
B. K. Rastogi ◽  
Indra Mohan
Keyword(s):  
Fault Plane ◽  
Time Lag ◽  
India Meteorological Department ◽  
Activity Level ◽  
Research Station ◽  
Fault Plane Solution ◽  
Plane Solution ◽  
Maximum Expected Magnitude ◽  
Different Origin

abstract Data now available on the Koyna earthquake have been studied in detail. Different origin times and epicenters given by India Meteorological Department and Central Water and Power Research Station, field evidences and nature of the seismograms for this earthquake suggest a multiple event. A fault plane solution has been obtained by using the sense of first motions. Seismicity in Koyna region has been found to increase with the increase of water level in the reservoir and vice-versa with a certain time lag. The two major earthquakes of this region have similar foreshock-aftershock pattern, corresponding to type 2 of Mogi's (1963) models. Aftershocks of this earthquake are related by a function Log N = a + bM, value of b being −0.8. Possibility of predicting maximum expected magnitude at a certain seismic activity level of Koyna region has been also pointed out.

Surface fault traces, fault plane solution and spatial distribution of the aftershocks of the September 13, 1986 earthquake of Kalamata (Southern Greece)

1988 ◽  
Vol 126 (1) ◽  
pp. 55-68 ◽  
Author(s):  
B. Papazachos ◽  
A. Kiratzi ◽  
B. Karacostas ◽  
D. Panagiotopoulos ◽  
E. Scordilis ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Fault Plane ◽  
Fault Plane Solution ◽  
Plane Solution ◽  
Southern Greece

A fault plane solution for the Carlisle earthquake, 26 December 1979

Nature ◽  
1980 ◽  
Vol 286 (5769) ◽  
pp. 142-143 ◽  
Author(s):  
Geoffrey King
Keyword(s):  
Fault Plane ◽  
Fault Plane Solution ◽  
Plane Solution
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