PECQ (BE)
Quarry blast4 August 2020
- Magnitude
- 2.2ML
- Depth
- –
- Belgian time
- 12:59:112020-08-04
- UTC
- 10:59:112020-08-04
Main parameters
| Date and time | 2020-08-04 10:59:11 UTC 2020-08-04 12:59:11 Belgian time |
|---|---|
| Magnitude | ML 2.2 |
| Epicentral coordinates | 50.670° N, 3.340° E Uncertainty ± 30.2 km |
| Event ID | ROB 10605 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-08-04 15:09:31 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
- 8
- Epicentral distance
- 35.9 – 145.9km
- Mean velocity, P wave
- 6.2km/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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 5 measurements, root-mean-square deviation 0.23 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 | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)8 stations | |||||
| LESLessines | 35.9 | 82 | 10:59:18.07+6.74 s | 10:59:21.87+10.54 s | 3.80 |
| SKQSteenkerque | 52.4 | 92 | 10:59:20.07+8.74 s | 10:59:26.78+15.45 s | 6.71 |
| BOUBougnies | 53.1 | 126 | 10:59:20.34+9.01 s | – | – |
| BRQBracquegnies | 60.2 | 110 | 10:59:21.68+10.35 s | – | – |
| DOUDourbes | 109.8 | 125 | 10:59:29.76+18.43 s | 10:59:43.29+31.96 s | 13.53 |
| GESGesves | 127.9 | 104 | 10:59:32.45+21.12 s | 10:59:49.72+38.39 s | 17.27 |
| CLAClavier | 141.9 | 101 | 10:59:36.08+24.75 s | 10:59:54.20+42.87 s | 18.12 |
| RCHRochefort | 145.9 | 112 | 10:59:36.63+25.30 s | 10:59:53.81+42.48 s | 17.18 |