ROCHEFORT (BE)
Known mine explosion31 July 2008
- Magnitude
- 1.8ML
- Depth
- 2.1km ± 3.8
- Belgian time
- 11:52:462008-07-31
- UTC
- 09:52:462008-07-31
Main parameters
| Date and time | 2008-07-31 09:52:46 UTC 2008-07-31 11:52:46 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.175° N, 5.231° E Uncertainty ± 2.4 km |
| Depth of hypocenter | 2.1 ± 3.8 km |
| Event ID | ROB 3127 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2009-05-30 18:17:43 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
- 2.3 – 73.4km
- Mean velocity, P wave
- 5.4km/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 2.1 km. P wave: 6 measurements, root-mean-square deviation 0.41 s. S wave: 5 measurements, root-mean-square deviation 0.95 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 | 2.3 | 188 | 09:52:47.29+0.35 s | 09:52:47.93+0.99 s | 0.64 | – |
| GESGesves | 25.5 | 336 | 09:52:51.41+4.47 s | 09:52:54.82+7.88 s | 3.41 | 81.0 |
| CLAClavier | 27.6 | 10 | 09:52:51.70+4.76 s | 09:52:52.95+6.01 s | 1.25 | 113.0 |
| DOUDourbes | 46.4 | 259 | 09:52:55.11+8.17 s | 09:53:01.09+14.15 s | 5.98 | 17.6 |
| KLBKalborn | 63.3 | 97 | 09:52:57.53+10.59 s | 09:53:05.32+18.38 s | 7.79 | 29.2 |
| MEMSMembach | 73.4 | 49 | 09:53:00.80+13.86 s | – | – | – |