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Active Structure Map (1:500,000) 'Tokyo' (2nd
edition)
The Active Fault Research Section published a 1:500,000 active
structural map 'Tokyo' (2nd edition) in 1998. It consists of three
maps (each about 80 cm wide, 55 cm high in 10 colors) and an explanatory
text (33 pages including reference lists). The price for a set
is \3,255 (including \155 consumption tax).
Please contact the distributors
to purchase.
Each of the maps covers an area ranging from 138ﾟE to 141ﾟE and
from 34ﾟ30′N to 36ﾟ30′N, which includes the whole of Tokyo (excluding
islands), Kanagawa, Chiba, and Saitama Prefectures, as well as
part of Ibaraki, Tochigi, Gunma, Nagano, and Shizuoka Prefectures.
The Active Structure Map, codes active faults, earthquake faults
(activate in histrical earthquakes), and old geological faults
by different colors. Formations and volcanoes of Quaternary age
are also displayed. Earlier geological formations are also shown.
The Seismotectonic Map shows the epicenters of earthquakes
exceeding M 6. Magnitude is shown by different sizes of circles.
Dates of earthquakes are appended to each of the epicenter circles.
The map also shows contours on the top of the upper surface of
the Pacific and Philippine Sea Plates.
The Gravity Structure Map shows gravity anomalies reflecting
the underground density structure (Bouguer anomaly). colors show
differences in depth to the basement rocks beneath the Kanto Plain
(exceeding 3,000 m deep in part of Saitama Prefecture).
Active faults are also shown in the seismotectonic map and the gravity structure map. The explanatory text briefly describes the characteristic features of active faults, earthquakes, and gravity structures. It is written in Japanese but contains an English abstract.