HALMA (BE)
Quarry blast6 November 2019
- Magnitude
- 1.0ML
- Depth
- 1.4km ± 4.2
- Belgian time
- 16:27:342019-11-06
- UTC
- 15:27:342019-11-06
Main parameters
| Date and time | 2019-11-06 15:27:34 UTC 2019-11-06 16:27:34 Belgian time |
|---|---|
| Magnitude | ML 1.0 |
| Epicentral coordinates | 50.075° N, 5.144° E Uncertainty ± 1.8 km |
| Depth of hypocenter | 1.4 ± 4.2 km |
| Event ID | ROB 8815 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-11-07 08:09:56 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
- 13
- Epicentral distance
- 10.7 – 99.1km
- Mean velocity, P wave
- 5.5km/s
- Mean velocity, S wave
- 3.2km/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 1.4 km. P wave: 13 measurements, root-mean-square deviation 0.43 s. S wave: 5 measurements, root-mean-square deviation 0.09 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)13 stations | ||||||
| RCHRochefort | 10.7 | 34 | 15:27:35.94+1.32 s | 15:27:37.43+2.81 s | 1.49 | – |
| GESGesves | 34.7 | 353 | 15:27:40.49+5.87 s | 15:27:44.85+10.23 s | 4.36 | – |
| MRDMaredsous | 36.9 | 313 | 15:27:40.88+6.26 s | 15:27:45.57+10.95 s | 4.69 | 12.5 |
| DOUDourbes | 39.4 | 273 | 15:27:41.24+6.62 s | 15:27:46.51+11.89 s | 5.27 | – |
| CLAClavier | 39.9 | 16 | 15:27:41.20+6.58 s | 15:27:46.43+11.81 s | 5.23 | 4.0 |
| HOUHouvegnez | 68.9 | 63 | 15:27:46.15+11.53 s | – | – | – |
| KLBKalborn | 69.1 | 87 | 15:27:46.43+11.81 s | – | – | – |
| TGATangissart | 73.7 | 323 | 15:27:48.34+13.72 s | – | – | – |
| WLFWalferdange | 85.6 | 122 | 15:27:49.41+14.79 s | – | – | – |
| MEMHMembach | 85.6 | 46 | 15:27:49.83+15.21 s | – | – | – |
| TNLTernell | 90.3 | 51 | 15:27:50.78+16.16 s | – | – | – |
| BOUBougnies | 92.4 | 293 | 15:27:49.77+15.15 s | – | – | – |
| SKQSteenkerque | 99.1 | 311 | 15:27:52.24+17.62 s | – | – | – |
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