GERPINNES (BE)
Quarry blast13 August 2018
- Magnitude
- 1.5ML
- Depth
- 6.7km ± 3.6
- Belgian time
- 10:40:522018-08-13
- UTC
- 08:40:522018-08-13
Main parameters
| Date and time | 2018-08-13 08:40:52 UTC 2018-08-13 10:40:52 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.304° N, 4.558° E Uncertainty ± 3.1 km |
| Depth of hypocenter | 6.7 ± 3.6 km |
| Event ID | ROB 7110 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-08-13 11:10:41 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
- 9
- Epicentral distance
- 15.0 – 134.6km
- Mean velocity, P wave
- 6.2km/s
- Mean velocity, S wave
- 3.5km/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 6.7 km. P wave: 8 measurements, root-mean-square deviation 0.63 s. S wave: 4 measurements, root-mean-square deviation 0.10 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)9 stations | ||||||
| MRDMaredsous | 15.0 | 91 | 08:40:56.11+3.23 s | 08:40:57.69+4.81 s | 1.58 | – |
| DOUDourbes | 23.4 | 173 | 08:40:57.25+4.37 s | 08:40:59.77+6.89 s | 2.52 | – |
| GESGesves | 38.7 | 76 | 08:40:59.99+7.11 s | – | – | – |
| RCHRochefort | 50.5 | 109 | 08:41:00.23+7.35 s | 08:41:07.51+14.63 s | 7.28 | 19.7 |
| SKQSteenkerque | 51.2 | 319 | 08:41:00.25+7.37 s | – | – | – |
| LESLessines | 68.0 | 312 | 08:41:03.64+10.76 s | – | – | – |
| LCHLa Chartreuse | 82.8 | 63 | 08:41:06.74+13.86 s | – | – | – |
| KLBKalborn | 113.0 | 101 | 08:41:11.48+18.60 s | 08:41:25.53+32.65 s | 14.05 | – |
| WLFWalferdange | 134.6 | 121 | 08:41:16.45+23.57 s | 08:41:32.22+39.34 s | 15.77 | – |