Spatiotemporal Relationship between Geodetic and Seismic Quantities: A Possible Clue to Preparatory Processes of M ≥ 6.0 Inland Earthquakes in Japan

Table 1

Tabulated information on input parameters required at each step of statistical evaluation system. The related schematic explanation should be referred to Figure 2.

No.

Parameter

(1)

Range of region for analysis (inland Japan)

(2)

Interval between spatial grids (0.05°)

(3)

Interval between time grids (three month)

(4)

Time period referred to for calculating physical quantities such as dilatation rate for each time grid (two years)

(5)

Range of depth (0 ≤ depth ≤ 30 km)

(6)

Range of magnitude (M ≥ 1.0)

(7)

Smoothing (weight-adjusting) parameters for obtaining spatially gridded physical quantities (refer to Figure 2(a))

(8)

Search radius for applying smoothing parameters to area centered at a calculation grid (Figure 2(a))

(9)

Search radius for calculating statistical index for a calculation grid (60 km)

(10)

Approval method for classifying the temporal change in statistical index R(t) into three categories (Figure 2(b))

(11)

Confidence level for statistical approval (95%)

(12)

Calculation period of total seismic energy released following calculation period of temporal change in statistical index R(t) (Figure 2(b))

(13)

Lower limit of total seismic energy released during period (12) which is regarded as seismically active (Figure 2(b))

(14)

Definition of large inland earthquakes (lower limit of magnitudes) (M ≥ 6.0)

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