Review of Previous Studies on M -class Earthquakes …Takeo Ishibe *, Akihito Nishiyama , Kenji...

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149

Bull. Earthq. Res. Inst.

Univ. Tokyo

Vol. pp.

* e-mail : ishibe@eri.u-tokyo.ac.jp

the Meiji-Tokyo earthquake, the and Ibaraki-ken Nanbu earthquakes, the Uraga-

Earthquake Research Institute, University of Tokyo

Association for Earthquake Disaster Prevention

The Earthquake Research Committee of the Headquarters of Earthquake Research and Promo-

tion estimated the probability of an earthquake of magnitude around . occurring during the next

years as . This is based on five earthquakes that occurred in the southern Kanto region (i.e.,

channel earthquake and the Chiba-ken Toho-Oki earthquake). However, it has been revealed

that the Kanto region is situated on complicated tectonic conditions due to subduction of the Phil-

ippine Sea Plate and the Pacific Plate beneath the continental plate, and that various types of earth-

quake occur. Therefore, it is necessary to classify these earthquakes into interplate and slab earth-

quakes, and to estimate their recurrence intervals. In this paper, at the outset of such studies, we

review previous studies on two earthquakes (the Meiji-Tokyo and Ibaraki-ken Nanbu

earthquakes) that occurred in the Meiji era and collect the data.

: M class earthquakes, the Meiji Tokyo Earthquake, the Ibaraki-ken Nanbu

Earthquake, the southern Kanto region

PAC PHS

Matsu’ura

Abe, PHS

*

Takeo Ishibe *, Akihito Nishiyama , Kenji Satake and Kunihiko Shimazaki

et al.,

Abstract

Key words

The Meiji Tokyo Earthquake and the Ibaraki-ken Nanbu

Earthquake

M

Review of Previous Studies on M -class Earthquakes

that Occurred in the Southern Kanto Region and Data

Collection

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Fig. . Five earthquakes (i.e., the Meiji-Tokyo earthquake, the Ibaraki-ken Nanbu

earthquake, the Ibaraki-ken Nanbu (Ryugasaki) earthquake, the Uraga-channel

earthquake and the Chiba-ken Toho-Oki earthquake) used to estimate the occurrence

probability of ‘other M class earthquakes have occurred in the southern Kanto region’.

The epicenter and magnitude of the Chiba-ken Toho-Oki earthquake are based on

the Japan Meteorological Agency (JMA), and others are based on Utsu ( ).

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Table . Documents on the Meiji-Tokyo earthquake.

a a, b

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graph at the Seismological Institute, Hongo, Tokyo (from

Fig. . Seismic waveform of the Meiji-Tokyo earth-

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Sekiya and Omori, ).

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Fig. . Seismic intensity distribution map of the Meiji-Tokyo earthquake by (a) Central Meteorological

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Fig. . Hypocentral distribution in southwestern Ibaraki prefecture from the unified JMA

catalog (Oct. May , hypocentral depth km, M . ).

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Table . Documents on the Ibaraki-ken Nanbu earthquake.

Fig. . Seismic intensity distribution map of the Ibaraki-ken Nanbu earthquake by

(a) Central Meteorological Observatory ( c), (b) Ishibashi ( ), (c) Kanbayashi and

Katsumata ( ) and (d) Usami ( )

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Destructive Earthquake of June,

M

amplitude for magnitude calculation,

, . .

b,

. .

No. .

Magnitude .

.

.

.

a,

.

. Okada, Y. and K. Kasahara, , Earthquake of , o

b, Chiba, central Japan and possible triggering of eastern

Tokyo earthquake of , , .

.

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. a,

b, .

. b,

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b, . c,

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d, ,

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.

.

pp.

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.

pp.

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.

. .

Matsu’ura, M., T. Iwasaki, Y. Suzuki and R. Sato, , Stat-

ical and Dynamical Study on Faulting Mechanism of .

the Kanto Earthquake,

, . .

. .

Sekiya S. and F. Omori., , The Diagram of the Semi-

, ( ).

. Sekiya S. and F. Omori., , The Diagram of the Semi-

destructive Earthquake of June th (Tokyo),

.

. , .

.

. Shimazaki K., , Unusually low seismic activity in the

a, focal region of the great Kanto earthquake of .

J. Coll. of Sci. Imp. Univ.

Papers in Meteor-ology and Geophysics,

Tectonophysics,

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.

. pp.

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Appendix A. Strong earthquake and its aftershocks of , June

(from Omori, ).

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B b

Appendix B. Table of damage in the Tokyo Metropolitan area

(from Omori, b).

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Appendix C. Record of seismic waveform and report of seismological data

(from Omori, c).

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mm

mm

.

mm sec

mm sec mm sec mm

.

mm sec

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mm

D a

Appendix D. : of , June,

(from Central Meteorological Observatory, a).

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,

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+

+

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+ 2 +

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