Fault length of small-sized earthquakes as estimated from the pulse width of initial P wave.

Ohtake, Masakazu

doi:10.4294/jpe1952.34.397

Cited by 3 publications

(4 citation statements)

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“…1), the pulse width of displacement at the observation station is calculated from simple physics as (OHTAKE, 1986):…”

Section: Theory and Methodsmentioning

confidence: 99%

“…The correction term can be easily assessed by the pulse width of very small earthquakes for which T is expected to be negligibly small (FRANKEL and KANAMORI, 1983;OHTAKE, 1986). Effects of site and instrument are also incorporated in this correction term but it is not necessary to consider the station dependence since we use the data from the same seismometer at the same observation station.…”

Section: Theory and Methodsmentioning

confidence: 99%

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Fault Lengths During the Patras 1993 Earthquake Sequence as Estimated from the Pulse Width of Initial P Wave

Tselentis¹

1998

Pure appl. geophys.

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The pulse width of the initial P wave was measured for three clusters of the aftershock sequence of the Patras (5.4 M S ) July 1993 earthquake. The data set consists of pulse width measurements of 250 microearthquakes recorded at a low-noise station of the University of Patras Seismological Network between 4-7-1993 and 1-8-1993. The statistical relation between the fault length and the earthquake magnitude was established for each one of the three clusters and is compared with other published relations. The relation also, between seismic moment and fault length was examined and showed a dependence upon the prevailing tectonic regime.

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“…1), the pulse width of displacement at the observation station is calculated from simple physics as (OHTAKE, 1986):…”

Section: Theory and Methodsmentioning

confidence: 99%

Section: Theory and Methodsmentioning

confidence: 99%

Fault Lengths During the Patras 1993 Earthquake Sequence as Estimated from the Pulse Width of Initial P Wave

Tselentis¹

1998

Pure appl. geophys.

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“…The pulse width, however, is also a function of such source factors as the source duration time and focal mechanism. For the largest earthquake we used, M = 1.7, the initial pulse width (limit when the travel time approaches zero) r 0 is estimated as about 4 ms on the average from the empirical formula of Ohtake [ 1986], log r 0 = 0.58M-3.42…”

Section: Source Effkcts On the Pulse Widthmentioning

confidence: 99%

Temporal change of Q_p⁻¹ in focal area of 1984 Western Nagano, Japan, Earthquake as derived from pulse width analysis

Ohtake¹

1987

J. Geophys. Res.

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On the basis of the pulse width broadening of initial P waves, temporal change of Qp−1 was investigated for the focal area of the 1984 western Nagano, central Japan earthquake of M = 6.8. Qp−1 in the focal area, ranging between 3.9 × 10−3 and 10.0 × 10−3, was significantly higher than that of the surrounding area, 2.8 × 10−3, throughout the 1.3‐year postseismic stage that we examined. The highest value, however, appeared not just after the main shock but for the period from 1 day to 2 months following the main shock. After the maximum attenuation was attained, Qp−1 in the focal area monotonically decreased, approaching the value of the surrounding area. This characteristic feature of Qp−1 change is successfully accounted for by the model in which newly opened cracks are gradually saturated by interstitial fluid. Qp−1 of the focal area was much higher than the surrounding area even for the period prior to the main shock. The high attenuation of the preseismic stage is probably a consequence of the earthquake swarm which preceded the M = 6.8 earthquake. However, there remains a possibility that attenuation intensity in the focal area increased as a precursor to the western Nagano earthquake.

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“…?_5.0) by analyzing P-and S-waveforms recorded at epicentral distances of about 200 km, which seem to be too large to investigate the detailed source process. FRANKEL and KANAMORI (1983), O'NEILL (1984), andOHTAKE (1986) analyzed the pulse width of P-wave initial motions and estimated the source dimension of earthquakes with magnitudes up to about 4 or 5. There have been few studies, however, on the detailed source process of small earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Complex source process of a small earthquake with M4.8.

Nishigami

1989

J,Phys,Earth

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Fault length of small-sized earthquakes as estimated from the pulse width of initial P wave.

Cited by 3 publications

References 16 publications

Fault Lengths During the Patras 1993 Earthquake Sequence as Estimated from the Pulse Width of Initial P Wave

Fault Lengths During the Patras 1993 Earthquake Sequence as Estimated from the Pulse Width of Initial P Wave

Temporal change of Q_p⁻¹ in focal area of 1984 Western Nagano, Japan, Earthquake as derived from pulse width analysis

Complex source process of a small earthquake with M4.8.

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Fault length of small-sized earthquakes as estimated from the pulse width of initial P wave.

Cited by 3 publications

References 16 publications

Fault Lengths During the Patras 1993 Earthquake Sequence as Estimated from the Pulse Width of Initial P Wave

Fault Lengths During the Patras 1993 Earthquake Sequence as Estimated from the Pulse Width of Initial P Wave

Temporal change of Qp−1 in focal area of 1984 Western Nagano, Japan, Earthquake as derived from pulse width analysis

Complex source process of a small earthquake with M4.8.

Contact Info

Product

Resources

About

Temporal change of Q_p⁻¹ in focal area of 1984 Western Nagano, Japan, Earthquake as derived from pulse width analysis