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Table 1 List of the grid searches. East and north are measured from the summit. Elevation is above sea level. The residual E is based on Eq. (2) for the best-fit solution of each search. The first search was conducted for all four source mechanisms, and the best-fit tensile crack solution is shown. The second and third searches were conducted only for a tensile crack

From: Source mechanism of a VLP event immediately before the 2014 eruption of Mt. Ontake, Japan

Parameter Minimum Maximum Interval Best-fit solution
First search
East −3200 m 3200 m 200 m −400 m
North −3200 m 3200 m 200 m −400 m
Elevation −3200 m 2800 m 200 m 2000 m
θ 90° 15° 75°
φ 345° 15°
E     56.1 %
Second search
East −1400 m 600 m 40 m −320 m
North −1400 m 600 m 40 m −440 m
Elevation 1000 m 2800 m 40 m 2040 m
θ 30° 120° 80°
φ −45° 45°
E     55.2 %
Third (final) search
East −720 m 80 m 40 m −360 m
North −840 m −40 m 40 m −480 m
Elevation 1640 m 2440 m 40 m 2040 m
θ 65° 95° 79°
φ −10° 20°
E     55.1 %