HELKIJN (BE)
Known mine explosion5 November 2008
- Magnitude
- 1.4ML
- Depth
- 1.2km ± 3.1
- Belgian time
- 12:46:532008-11-05
- UTC
- 11:46:532008-11-05
Main parameters
| Date and time | 2008-11-05 11:46:53 UTC 2008-11-05 12:46:53 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.733° N, 3.386° E Uncertainty ± 2.1 km |
| Depth of hypocenter | 1.2 ± 3.1 km |
| Event ID | ROB 3918 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2012-04-27 16:33:58 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
- 7
- Epicentral distance
- 49.9 – 205.9km
- Mean velocity, P wave
- 6.0km/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 1.2 km. P wave: 4 measurements, root-mean-square deviation 0.01 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)7 stations | ||||||
| SKQSteenkerque | 49.9 | 101 | 11:47:02.15+8.63 s | 11:47:08.20+14.68 s | 6.05 | – |
| BOUBougnies | 55.1 | 134 | 11:47:02.99+9.47 s | 11:47:09.69+16.17 s | 6.70 | – |
| RQRRonquières | 61.0 | 103 | 11:47:03.99+10.47 s | 11:47:11.41+17.89 s | 7.42 | 11.1 |
| SNFSeneffe | 68.2 | 111 | 11:47:05.21+11.69 s | – | – | – |
| GESGesves | 126.6 | 107 | 11:47:14.95+21.43 s | 11:47:27.61+34.09 s | 12.66 | – |
| CLAClavier | 140.1 | 104 | 11:47:17.18+23.66 s | 11:47:34.15+40.63 s | 16.97 | 6.5 |
| KLBKalborn | 205.9 | 109 | 11:47:26.05+32.53 s | – | – | – |