Zisin (Journal of the Seismological Society of Japan. 2nd ser.)

Crustal Structure in the Profile Across the Northeastern Part of Honshu, Japan, as Derived from Explosion Seismic Observations

Part 1. Observations of Seismic Waves Generated from the Off Kesennuma, the Off Oga Peninsula and the Tutihata Explosions

The Research Group for Explosion Seismology

1968 Volume 21 Issue 4 Pages 259-272
Published: February 25, 1969
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.4294/zisin1948.21.4_259

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In the middle of March 1965, more than fifty shots were fired at sea Off Kesennuma in the northeastern part of Honshu for sixteen temporary observation sites on land and a receiving vessel. The amount of explosives is relatively small, 450kg in maximum, in comparison with the land shots. In early March 1966, an explosion at Tutihata Mine and twenty-one shots at the Off Oga Peninsula were fired for almost the same temporary stations with those in the Off Kesennuma explosions. In these experiments, good records were obtained through the profile. These experiments in the northeastern part of Honshu are described and the observational results are presented.

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Crustal Structure in the Profile Across the Northeastern Part of Honshu, Japan, as Derived from Explosion Seismic Observations

Part 2. Crustal Structure

Michio HASHIZUME, Kazuo OIKE, Shuzo ASANO, Hiroyuki HAMAGUCHI, Atusi O ...

1968 Volume 21 Issue 4 Pages 273-281
Published: February 25, 1969
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.4294/zisin1948.21.4_273

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The crustal structure in a profile crossing the northeastern part of Honshu, Japan, is derived from the data obtained in the Off Kesennuma, the Off Oga Peninsula and the Tutihata explosions. The fixed array-moving shot point technique was first applied in this profile, and more than 600 seismograms were obtained. Assuming a homogeneous layered structure, the thickness of the crust in the central mountain area was obtained as 30km. The crust tapers near the shore toward the ocean on both sides of Honshu, and the transition of crustal structure from the continental to the oceanic seems to occur in the vicinity of Honshu. The existence of the basaltic layer and the value of 8.0km/s for P_n velocity became more convincing through the analysis of this profile.

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Plane and Spherical Wave Velocities and Energy Flow in Anisotropic Media

Junzo KASAHARA, Isao SUZUKI, Mineo KUMAZAWA, Kumizi IIDA

1968 Volume 21 Issue 4 Pages 282-292
Published: February 25, 1969
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.4294/zisin1948.21.4_282

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Conception of the “wave surface” related to spherical wave and of the “velocity surface” related to plane wave in anisotropic media is mentioned. We measured experimentally the wave surface with Sanbagawa green schist (No. 904). Further, we measured elastic constants of this Sanbagawa green schist, and the wave surfaces obtained from experiments and calculation were consistent. We measured the direction of energy flow with green schist. This direction was closely related to the wave surface.

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Descriptive Table of Tsunamis in and near Japan

Hideo WATANABE

1968 Volume 21 Issue 4 Pages 293-313
Published: February 25, 1969
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.4294/zisin1948.21.4_293

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Table of tsunamis which occurred in and near Japan was prepared. The table consists of two parts. One part (Table 1) is the table of tsunamis caused by earthquakes, vocanic eruptions and landslides which occurred in and near Japan. Another one (Table 2) is the table of tsunamis which occurred in the Pacific Ocean and additionally invaded Japan and its vicinity.
1) Table 1.
The contents of the table are:
a) Sequential number
b) Date in the Christian and Japanese Calendar (Time in Japanese Standard Time)
c) Location of tsunami source or epicentral region together with longitude, latitude and depth of hypocenter
d) Magnitude of earthquake
e) Grade magnitude of tsunami by Dr. A. IMAMURA and Dr. K. IIDA
f) Description of earthquake and tsunami.
Magnitude of earthquake, and longitude, latitude and depth of hypocenter were taken from the “Rika-nenpyo (1968)”, the “Catalogue of major earthquakes which occurred in and near Japan, supplementary volume No. 1 (1958), No. 2 (1966) and No. 3 (1968)” and the “Zisin-geppo (1968)”.
2) Table 2.
The contents of the table are:
a), c) and f) The same content as the Table 1
b) Date in the Christian Calendar (Time in Greenwich Mean Time)
e) Grade magnitude of tsunami occurred in the Pacific Ocean and invaded Japan and its vicinity.
Magnitude of earthquake, and longitude, latitude and depth of hypocenter were taken from the “Seismicity of the Earth and Related phenomena (1954)” and the report of the U. S. Coast and Geodetic Survey.

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The Tsunami of April 24, 1771

Hisashi MIYOSHI

1968 Volume 21 Issue 4 Pages 314-316
Published: February 25, 1969
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.4294/zisin1948.21.4_314

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On the Disappearance of Magnetic Anomaly Lineations

Hitoshi TAKEUCHI

1968 Volume 21 Issue 4 Pages 316
Published: February 25, 1969
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.4294/zisin1948.21.4_316

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Crustal Deformations Before and After Great Earthquakes and The Mantle Convection

Hitoshi TAKEUCHI, Hiroo KANAMORI

1968 Volume 21 Issue 4 Pages 317
Published: February 25, 1969
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.4294/zisin1948.21.4_317

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