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Table 1. Calculated Coulomb stress change and normal stress change for each earthquake sequence. Normal stress is defined as positive for unclamping.

From: Shallow inland earthquakes in NE Japan possibly triggered by the 2011 off the Pacific coast of Tohoku Earthquake

Region

Date (JST)

M

Lat.

Lon.

h

ΔCFF (μ = 0.65) (MPa)

Normal Stress (MPa)

      

Plausible

Conjugate

Plausible

Conjugate

N._Akita

Apr. 1, 2011

5.1

40.26

140.37

10

0.01

−0.10

0.33

0.17

C._Akita 3-14

Mar. 14, 2011

3.2

39.59

140.42

2

1.00

0.67

0.82

0.29

C._Akita 3-28

Mar. 28, 2011

4.2

39.59

140.44

3

1.05

0.90

0.73

0.48

C._Akita (Tazawa)

Apr. 3, 2011

3.4

39.57

140.53

3

1.22

0.86

0.96

0.36

Yamagata-swarm

Apr. 4, 2011

2.2

38.53

140.00

7

0.29

−0.39

1.03

0.11

Aizu-swarm

Mar. 20, 2011

2.5

37.73

139.97

9

0.20

−0.13

0.60

0.07

Akita-Oki

Mar. 12, 2011

6.4

40.39

139.25

16

0.20

0.08

0.27

0.02

Iwaki_3-23

Mar. 23, 2011

6.0

37.09

140.79

7

0.60

0.34

0.47

0.08

Kita-Ibaraki

Mar. 19, 2011

6.1

36.79

140.57

6

0.44

0.37

0.27

0.15

N._Nagano

Mar. 12, 2011

6.3

36.99

138.61

8

0.01

−0.01

0.04

0.01

E._Shizuoka

Mar. 15, 2011

6.1

35.32

138.72

15

0.02

0.03

−0.01

0.06