HALMA (BE)
Known mine explosion31 July 2008
- Magnitude
- 1.6ML
- Depth
- 0.8km ± 3.9
- Belgian time
- 14:00:392008-07-31
- UTC
- 12:00:392008-07-31
Main parameters
| Date and time | 2008-07-31 12:00:39 UTC 2008-07-31 14:00:39 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.079° N, 5.128° E Uncertainty ± 1.2 km |
| Depth of hypocenter | 0.8 ± 3.9 km |
| Event ID | ROB 3126 |
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
- 4
- Epicentral distance
- 11.1 – 70.3km
- Mean velocity, P wave
- 5.5km/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 0.8 km. P wave: 4 measurements, root-mean-square deviation 0.14 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)4 stations | ||||||
| RCHRochefort | 11.1 | 40 | 12:00:40.86+1.44 s | – | – | – |
| GESGesves | 34.2 | 355 | 12:00:45.36+5.94 s | 12:00:49.72+10.30 s | 4.36 | 35.4 |
| DOUDourbes | 38.2 | 273 | 12:00:46.09+6.67 s | 12:00:51.09+11.67 s | 5.00 | 25.0 |
| KLBKalborn | 70.3 | 88 | 12:00:51.66+12.24 s | 12:01:00.16+20.74 s | 8.50 | 18.3 |
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