HELKIJN (BE)
Known mine explosion18 September 2015
- Magnitude
- 1.9ML
- Depth
- 9.8km ± 3.5
- Belgian time
- 13:01:362015-09-18
- UTC
- 11:01:362015-09-18
Main parameters
| Date and time | 2015-09-18 11:01:36 UTC 2015-09-18 13:01:36 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.712° N, 3.393° E Uncertainty ± 3.3 km |
| Depth of hypocenter | 9.8 ± 3.5 km |
| Event ID | ROB 5408 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2015-09-18 14:15:58 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
- 11
- Epicentral distance
- 31.8 – 204.7km
- Mean velocity, P wave
- 6.3km/s
- Mean velocity, S wave
- 3.6km/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 9.8 km. P wave: 7 measurements, root-mean-square deviation 0.33 s. S wave: 6 measurements, root-mean-square deviation 0.37 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)11 stations | ||||||
| LESLessines | 31.8 | 90 | 11:01:42.44+6.39 s | 11:01:46.07+10.02 s | 3.63 | – |
| SKQSteenkerque | 49.1 | 98 | 11:01:44.27+8.22 s | 11:01:49.76+13.71 s | 5.49 | – |
| BOUBougnies | 53.1 | 132 | 11:01:45.37+9.32 s | 11:01:51.72+15.67 s | 6.35 | – |
| BRQBracquegnies | 58.5 | 116 | 11:01:45.60+9.55 s | – | – | – |
| RQRRonquières | 60.0 | 101 | 11:01:45.87+9.82 s | 11:01:53.91+17.86 s | 8.04 | – |
| MRDMaredsous | 107.7 | 115 | 11:01:53.56+17.51 s | 11:02:07.01+30.96 s | 13.45 | – |
| DOUDourbes | 109.6 | 128 | 11:01:54.13+18.08 s | 11:02:07.51+31.46 s | 13.38 | – |
| GESGesves | 125.4 | 106 | 11:01:56.77+20.72 s | 11:02:12.26+36.21 s | 15.49 | – |
| CLAClavier | 139.1 | 103 | 11:01:59.88+23.83 s | 11:02:16.43+40.38 s | 16.55 | 14.6 |
| MEMSMembach | 185.4 | 93 | 11:02:07.40+31.35 s | 11:02:28.93+52.88 s | 21.53 | – |
| KLBKalborn | 204.7 | 108 | 11:02:05.16+29.11 s | 11:02:29.92+53.87 s | 24.76 | – |