Faculty Profiles - TAKENAKA Hiroshi

MISC - TAKENAKA Hiroshi

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Shear-wave anisotropy in the aftershock waveforms of the 1997 Northwestern Kagoshima earthquake. (1).

藤井雄士郎, 竹中博士, 松島健, 馬越孝道

地球惑星科学関連学会合同大会予稿集 1998 1998

Observation and waveform modeling of the aftershocks of the 1997 Northwestern Kagoshima earthquake

FUJII Y, FUTAMURE H, TAKENAKA H, MATSUSHIMA T, UMAKOSHI K, TASHIRO K, SUZUKI S

日本地震学会講演予稿集 = Programme and abstracts, the Seismological Society of Japan 1997 ( 2 ) 145 1997.9

Teleseismic waveform synthesis for ocean-bottom stations using a new, very effective 2.5-D finite difference technique(共著)

Proceedings of International Workshop on Scientific Use of Submarine Cables(Feb. 25-28,1997, Okinawa Japan) 23 - 26 1997

Comparison of Q(C)(-1) estimates from coda envelopes constructed from one- and multi-component seismograms

Y Mamada, H Takenaka

JOURNAL OF PHYSICS OF THE EARTH 45 ( 6 ) 455 - 466 1997

Coda Q(-1) in Awaji Island estimated from the aftershock records of the 1995 Hyogo-ken Nanbu earthquake

Y Mamada, T Okumura, H Takenaka, S Suzuki, S Saito, M Furumura, T Sasatani, T Matsushima, T Furumura

JOURNAL OF PHYSICS OF THE EARTH 45 ( 2 ) 147 - 154 1997

Waveform analysis of the felt-earthquakes associated with the endogenous growth of the lava dome at Unzen Volcano

OKAMATSU N.

Unzen International workshop: decade volcano and scientific drilling, Proceedings 37 - 39 1997

Comparison of Q(C)(-1) estimates from coda envelopes constructed from one- and multi-component seismograms

Y Mamada, H Takenaka

JOURNAL OF PHYSICS OF THE EARTH 45 ( 6 ) 455 - 466 1997

Modelling of Strong Motion at Kikai Island due to Aftershocks of the 1995 Amami-Oshima-Kikai Earthquakes

TAKENAKA Hiroshi, FUJII Yushiro, OKUMURA Takashi, SUZUKI Sadaomi

Journal of Geography (Chigaku Zasshi) 106 ( 4 ) 525 - 536 1997

Language：Japanese Publisher：Tokyo Geographical Society

Twin earthquakes (the Amami-Oshima-Kinkai Earthquakes) occurred at the southeast from Kikai Island on October 18 (M_JMA 6.6) and 19 (M_JMA 6.5), 1995. We observed the aftershocks at Kikai Island from October 21, 1995 to February 18, 1996 using the broadband strong-motion seismometer (VSE11C/12C). After all, we observed 40 events that include the second largest aftershock, the event of November 1 (M_JMA 5.6).<BR>In this paper we model the strong-motion records of six events among the observed aftershocks, which have large amplitudes and rather simple waveforms to estimate their focal parameters (focal depth, strike, dip, rake, seismic moment and rise time), by try and error. The results suggest the following : <BR>(1) The strikes of the mainshocks of October 18 (the first mainshock) and 19 (the second mainshock) might be about N230°E and N185°E, respectively;<BR>(2) The hypocenter of the first mainshock might locate near the north edge of the fault which was ruptured from north to south along the fault strike, while the hypocenter of the second one might locate near the south edge of the fault which was ruptured from south to north.

DOI： 10.5026/jgeography.106.4_525

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Waveform analysis of the felt earthquakes associated with the endogenous growth of the lava dome at Unzen volcano (共著)

Proceedings of Unzen International Workshop : Decade Volcano and Scientific Drilling 37 - 39 1997

Coda Q(-1) in Awaji Island estimated from the aftershock records of the 1995 Hyogo-ken Nanbu earthquake

Y Mamada, T Okumura, H Takenaka, S Suzuki, S Saito, M Furumura, T Sasatani, T Matsushima, T Furumura

JOURNAL OF PHYSICS OF THE EARTH 45 ( 2 ) 147 - 154 1997

Teleseismic waveform synthesis for ocean-bottom stations using a new, very effective 2.5-D finite difference technique(共著)

Proceedings of International Workshop on Scientific Use of Submarine Cables(Feb. 25-28,1997, Okinawa Japan) 23 - 26 1997

Sensing of faults by teleseismic waveform data. III. Improvement in the detectability of subsurface faults.

村越匠, 竹中博士, 末次大輔

地球惑星科学関連学会合同大会予稿集 1997 1997

A time-domain FDM for 2.5-D elastic plane-wave incidence problems.

竹中博士, 岡元太郎, KENNETT B L N

地球惑星科学関連学会合同大会予稿集 1997 1997

A ”simple” estimation method for VP/VS of a sedimentary layer by amplitudes of S and SP phases.

竹中博士, 斉田智治, 藤井雄士郎

地球惑星科学関連学会合同大会予稿集 1997 1997

A new 2.5D method for far-field body waves. Application to the 1992 Nicaraguan tsunami earthquake.

岡元太郎, 竹中博士

日本地震学会秋季大会講演予稿集 1997 1997

A very effective 2.5-D method for teleseismic body-wave synthesis.

竹中博士, 岡元太郎, KENNETT B L N

日本地震学会秋季大会講演予稿集 1997 1997

Simultaneous Observation using Broadband Seismometers. (II).

吉田康宏, 神定健二, 金嶋聡, 大滝寿樹, 田中明子, 末次大輔, 神谷真一郎, 石原靖, 竹中博士

日本地震学会秋季大会講演予稿集 1997 1997

Comparison Qc estimated from S coda envelope of vector amplitude with that of 1 component amplitude.

侭田豊, 竹中博士

地球惑星科学関連学会合同大会予稿集 1997 1997

A 2.5-D time-domain elastodynamic equation for a general anisotropic medium

H Takenaka, BLN Kennett

GEOPHYSICAL JOURNAL INTERNATIONAL 127 ( 2 ) F1 - F4 1996.11

Language：English Publisher：OXFORD UNIV PRESS

In order to provide a quantitative analysis of real seismic records from complex regions we need to be able to calculate the wavefields in three dimensions. However, full 3-D modelling of seismic-wave propagation is still computationally intensive. An economical approach to the modelling of seismic-wave propagation which includes many important aspects of the propagation process is to examine the 3-D response of a model where the material parameters vary in two dimensions. Such a configuration, in which a 3-D wavefield is calculated for a 2-D medium, is called the '2.5-D problem'. Recently, Takenaka & Kennett (1996) proposed a 2.5-D time-domain elastodynamic equation for seismic wavefields in models with a 2-D variation in structure but obliquely incident plane waves in the absence of source. This approach is useful even for non-plane waves. In the presence of source a new 2.5-D elastodynamic equation for general anisotropic media can be derived in the time domain based on the Radon transform over slowness in the direction with constant medium properties. The approach can also be formulated in terms of velocity-stress, a representation which is well suited to the use of numerical techniques for 2-D time-domain problems such as velocity-stress finite-difference or velocity-stress pseudospectral techniques.

DOI： 10.1111/j.1365-246X.1996.tb04716.x

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A 2.5-D time-domain elastodynamic equation for a general anisotropic medium

H Takenaka, BLN Kennett

GEOPHYSICAL JOURNAL INTERNATIONAL 127 ( 2 ) F1 - F4 1996.11

Language：English Publisher：OXFORD UNIV PRESS

DOI： 10.1111/j.1365-246X.1996.tb04716.x

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