Long-Term Seismic Activity and Present Microseismicity on Active Faults in Southwest Japan

Tsukuda, Tameshige

doi:10.1007/978-94-017-2738-9_4

Cited by 10 publications

(5 citation statements)

References 11 publications

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“…Quaternary stratigraphic studies of exposed fault zones provide the most definitive paleoseismological data for assessing earthquake hazards in many tectonically active areas [i.e., Clark et al, 1972;$ieh, 1978;Swan et al, 1980;Tsukuda, 1985]. However, many problems remain in interpreting the tectonic stratigraphic record with sufficient accuracy to recognize patterns of fault behavior useful in earthquake prediction.…”

Section: Introductionmentioning

confidence: 99%

Thermoluminescence dating of fault‐scarp‐derived colluvium: Deciphering the timing of paleoearthquakes on the Weber Segment of the Wasatch Fault Zone, north central Utah

Forman¹,

Nelson²,

McCalpin³

1991

J. Geophys. Res.

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The timing of middle to late Holocene faulting on the Weber segment of the Wasatch fault zone, Utah, is constrained by thermoluminescence (TL) and radiocarbon age estimates on fine‐grained, fault‐related colluvial sediments. The stratigraphy in two trenches excavated across fault scarps is characterized by a stack of three colluvial wedges, deposited in response to three separate faulting events, the oldest of which buried a soil developed on a middle Holocene debris flow. Thermoluminescence age estimates by the partial and total bleach methods and the regeneration method on fine‐grained colluvium from the trenches agree within 1 sigma and are concordant with the radiocarbon chronology. A synthesis of the TL and 14C age estimates indicate that these three faulting events occurred sometime between 4500 and 3500, between 3200 and 2500, and between 1400 and 1000 years ago. Detailed investigation of a sequence of fine‐grained, scarp‐derived distal colluvium shows that much of the sediment was deposited during <600‐year intervals immediately after faulting. The sedimentation rate of colluvium is inferred to increase shortly after faulting, and TL dating of these sediments provides additional information to constrain the timing of faulting events.

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Section: Introductionmentioning

confidence: 99%

Thermoluminescence dating of fault‐scarp‐derived colluvium: Deciphering the timing of paleoearthquakes on the Weber Segment of the Wasatch Fault Zone, north central Utah

Forman¹,

Nelson²,

McCalpin³

1991

J. Geophys. Res.

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“…Recurrence time from [Tsukuda, 1983] based on dating of paleoseismic events. Aftershocks of this event continue to at least 1969 without showing any indication of returning to a background rate .…”

Section: Discussionmentioning

confidence: 99%

Proceedings of the eighth joint meeting of the U.S.-Japan Conference on Natural Resources (UJNR) Panel on Earthquake Prediction Technology, November 16-21, 1992

Miyazaki¹

1993

Open-File Report

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The UJNR Panel on Earthquake Prediction Technology recognizes the critical improtance of promoting prediction research in both countries. The Eigth Joint Meeting was extremely beneficial in furthering friendship and deepening understanding of the common problems of both Japan and the U.S.Technical sessions included presentation of 27 papers, focussing on great subduction zone earthques in Japan and the U.S., including extensive discussion of national and agency programs, probabilistic methods of earthquake forecasting, earthquake precursors, fundamental earthquake studies, crustal structure and the M 7.5 Landers, California earthquake of 1992.Discussion was extremely frutiful, and the Panel unanimously adopted the following resolutions: 1. One of the most important means of achieveing joint progress is by the long-term exchange of researchers between our two countries. Since the First Joint Meeting such exchanges have already achieved extremely valuable results. We recognize the advantages of close coopearation between governmental and academic scientists in earthquake prediction research in both the United States and Japan. Each side should investigate possibilities for widening participation in the Panel. In this respect, the panel members recognize the importance of joint activities in the form of symposia, and support the proposal of cooperative programs on earthquake prediction research under the U.J.S.T. agreement. Efforts should also be made to cooperate on instrumental development, observations, data interpretation, and earthquake prediction experience, collocation between laser ranging, GPS and VLBI techniques, development of transportable VLBI and SLR systems, research on active faults, and laboratory rock mechanics. 2. We strongly agree that exchanges of data and analysis methods are mutually beneficial, and strongly encourage these activities. In particular, the Panel empahasizes the importance of sharing experience and exchanging data in the areas of geodetic measurements, crustal deformation and monitoring, precursory phenomena, modelling techniques, and automatic processing of both seismic and crustal deformation data. 3. Advances in the archiving and retrieval of seismic waveform data has created a new envornment for collaborative research. The panel endorses and encourages cooperation in the analysis of these data, and recognizes the potential for exchange of these data through computer network connections between our two countries. 4. Cooperation in the application of space techniques to prediction research is already in progress and should continue. Information on the precision geodetic measurements and GPS measurements for the detection of crustal deformation should be exchanged. Cooperative experiments using U.S. and Japanese laser ranging and VLBI facilities should be continued. 5. The next joint meeting will be held in Japan in the autumn of 1994. IX Paper Presented at the Eighth UJNR Meeting Y. Miyazaki, and Y. Egawa, Activities of the Coordinating Committee for Earthquake Prediction. B. A...

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“…It was due to inactivity in seismicity throughout the entire area of the Yamasaki fault that fewer earthquakes occurred for the period of the latter half of 1978 to 1979 than for any other period (TSUKUDA, 1985). Table 2.…”

Section: The Fukusaki Earthquake Of 1979mentioning

confidence: 99%

On features of spatial and temporal variation of seismicity before and after moderate earthquakes.

Shibutani

Oike

1989

J,Phys,Earth

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We have investigated spatial and temporal variation of seismicity before and after four moderate-size earthquakes (M=4.3-6.2) that occurred in active seismic zones in the Inner Zone of Southwest Japan.The results of the present study mainly from space-time distribution diagrams show that the typical variation in seismicity consists of the following four stages. In the first stage of the variation, precursory earthquake swarms occur. Secondly, a seismic gap is formed until the occurrence of a main shock. Thirdly, the area of aftershocks expands in two ways, that is gradual growing and leaping. In the fourth stage, seismic activity spreads out from the aftershock area. We propose calling the phenomenon in the fourth stage "diffusion of earthquakes." The velocity of the diffusion has been estimated at 100 to 200 km/year.

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Long-Term Seismic Activity and Present Microseismicity on Active Faults in Southwest Japan

Cited by 10 publications

References 11 publications

Thermoluminescence dating of fault‐scarp‐derived colluvium: Deciphering the timing of paleoearthquakes on the Weber Segment of the Wasatch Fault Zone, north central Utah

Thermoluminescence dating of fault‐scarp‐derived colluvium: Deciphering the timing of paleoearthquakes on the Weber Segment of the Wasatch Fault Zone, north central Utah

Proceedings of the eighth joint meeting of the U.S.-Japan Conference on Natural Resources (UJNR) Panel on Earthquake Prediction Technology, November 16-21, 1992

On features of spatial and temporal variation of seismicity before and after moderate earthquakes.

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