Figure5-8 Extension and compression in the Kanto region.
The directions of the two straight lines that cross each other in the figure are those of the maximum extension (or minimum compression; red) and the maximum compression (or minimum extension; blue), respectively. Also, the lengths of the straight lines are in proportion to the amount of extension or compression.
[Compiled from data from Geographical Survey Institute data and "Active Faults in Japan (Revised Edition)"]
A:The past approximately 100 years.
There has been a significant effect from the 1923 Kanto earthquake, primarily in the southern Kanto region.
B:The past approximately 10 years.
Compression is observed in a north-northwest to south-southeast direction, primarily in the southern Kanto region, caused by the subducting Philippine Sea Plate.