Table 2 Values for determination of the explosion origin time based on theoretical acoustic travel times.

From: Rich observations of local and regional infrasound phases made by the AlpArray seismic network after refinery explosion

Station

Dist./km

Azim./Deg.

Pick/UTC

Bounce dist./m

Cel./m/s

Travel time/s

Origin time/UTC

GRC3

14

357

03:12:27.30

–

–

–

–

GRC2

20

305

03:12:43.88

149

338

58.6

03:11:45.25

GRC1

26

348

03:13:04.82

–

–

–

–

A357B

30

104

03:13:06.34

–

–

–

–

A364A

31

200

03:13:15.40

305

339

94.5

03:11:40.94

GRB5

38

9

03:13:45.59

–

–

–

–

A363A

56

241

03:14:26.02

654

340

167.8

03:11:38.17

A369A

57

313

03:14:35.11

–

–

–

–

A361A

57

273

03:14:32.44

463

339

169.8

03:11:42.60

FFB2

71

200

03:15:11.14

848

340

212.2

03:11:38.88

A368A

86

298

03:16:00.38

870

338

254.7

03:11:45.63

      

Mean ± Std. dev.

03:11:41.9 ± 2.8 s

  1. Distance (dist.) denotes the distance from the explosion site. Azimuth (Azim.) indicates the azimuth from the explosion to the respective station. Bounce distance denotes the distance from the station to the closest calculated surface bounce point. el. denotes the modeled celerity. Note that several stations on the list correspond to the stations used for the location grid search, but have no matching bounce point available from ray tracing.
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