LA ROCHE-EN-ARDENNE (BE)
Known mine explosion22 September 2008
- Magnitude
- 1.2ML
- Depth
- 7.9km ± 6.0
- Belgian time
- 11:37:212008-09-22
- UTC
- 09:37:212008-09-22
Main parameters
| Date and time | 2008-09-22 09:37:21 UTC 2008-09-22 11:37:21 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.192° N, 5.593° E Uncertainty ± 1.1 km |
| Depth of hypocenter | 7.9 ± 6.0 km |
| Event ID | ROB 3752 |
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
- 6
- Epicentral distance
- 26.5 – 60.1km
- Mean velocity, P wave
- 6.0km/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 7.9 km. P wave: 5 measurements, root-mean-square deviation 0.17 s. S wave: 4 measurements, root-mean-square deviation 0.12 s.
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)6 stations | ||||||
| RCHRochefort | 26.5 | 261 | 09:37:26.07+4.55 s | 09:37:29.71+8.19 s | 3.64 | – |
| CLAClavier | 32.7 | 321 | 09:37:27.02+5.50 s | 09:37:31.56+10.04 s | 4.54 | – |
| KLBKalborn | 38.3 | 105 | 09:37:28.07+6.55 s | 09:37:33.10+11.58 s | 5.03 | 10.4 |
| GESGesves | 42.0 | 301 | 09:37:29.00+7.48 s | – | – | – |
| MEMSMembach | 55.1 | 32 | 09:37:30.95+9.43 s | – | – | – |
| MRDMaredsous | 60.1 | 282 | – | 09:37:39.10+17.58 s | – | – |