FRASNES (BE)
Known mine explosion4 August 2015
- Magnitude
- 2.0ML
- Depth
- 10.0km ± 5.5
- Belgian time
- 13:01:392015-08-04
- UTC
- 11:01:392015-08-04
Main parameters
| Date and time | 2015-08-04 11:01:39 UTC 2015-08-04 13:01:39 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.664° N, 3.503° E Uncertainty ± 3.8 km |
| Depth of hypocenter | 10.0 ± 5.5 km |
| Event ID | ROB 5393 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2015-08-05 08:04:37 Belgian time
Location map
- Epicentre
- Station that recorded the event
Arrival times at the stations
Each station first records the P wave, the fastest, then the S wave. The farther a station is from the epicentre, the later the waves reach it and the wider the gap between the two.
- Stations
- 10
- Epicentral distance
- 24.6 – 130.4km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.4km/s
- P wave
- S wave
- Curve fitted to the measurements
Notes and method
Curves: travel time of a direct wave in a homogeneous medium. The velocity of each wave and an origin-time shift, common to both, are fitted to the measurements by least squares. Hypocenter at a depth of 10.0 km. P wave: 9 measurements, root-mean-square deviation 0.59 s. S wave: 5 measurements, root-mean-square deviation 0.58 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
Station measurements
P- and S-wave arrivals and ground displacement measured at each station. Click a column heading to change the order.
| km | ° | UTC | UTC | s | nm | |
|---|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)10 stations | ||||||
| LESLessines | 24.6 | 78 | 11:01:44.49+4.71 s | 11:01:48.38+8.60 s | 3.89 | – |
| SKQSteenkerque | 40.8 | 92 | 11:01:46.66+6.88 s | – | – | – |
| BOUBougnies | 43.8 | 134 | 11:01:45.94+6.16 s | 11:01:53.68+13.90 s | 7.74 | 67.8 |
| BRQBracquegnies | 49.3 | 114 | 11:01:47.86+8.08 s | – | – | – |
| SNFSeneffe | 57.9 | 107 | 11:01:49.05+9.27 s | 11:01:56.31+16.53 s | 7.26 | – |
| OSTBOostende | 75.1 | 328 | 11:01:53.31+13.53 s | – | – | – |
| MRDMaredsous | 98.4 | 114 | 11:01:55.98+16.20 s | – | – | – |
| DOUDourbes | 100.2 | 129 | 11:01:56.18+16.40 s | 11:02:09.67+29.89 s | 13.49 | – |
| GESGesves | 116.5 | 105 | 11:01:59.09+19.31 s | 11:02:13.85+34.07 s | 14.76 | – |
| CLAClavier | 130.4 | 101 | 11:02:01.22+21.44 s | 11:02:16.90+37.12 s | 15.68 | – |