PECQ (BE)
Quarry blast1 June 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:01:152021-06-01
- UTC
- 11:01:152021-06-01
Main parameters
| Date and time | 2021-06-01 11:01:15 UTC 2021-06-01 13:01:15 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.690° N, 3.305° E Uncertainty ± 7.4 km |
| Event ID | ROB 13795 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-29 16:36:01 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
- 38.1 – 149.0km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.6km/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 0.59 s. S wave: 4 measurements, root-mean-square deviation 0.62 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 | 38.1 | 86 | 11:01:22.66+6.81 s | 11:01:26.39+10.54 s | 3.73 |
| SKQSteenkerque | 55.0 | 94 | 11:01:24.65+8.80 s | 11:01:30.53+14.68 s | 5.88 |
| BOUBougnies | 56.4 | 126 | 11:01:25.97+10.12 s | – | – |
| MRDMaredsous | 112.4 | 112 | 11:01:35.65+19.80 s | 11:01:48.23+32.38 s | 12.58 |
| DOUDourbes | 113.1 | 125 | 11:01:34.40+18.55 s | 11:01:46.95+31.10 s | 12.55 |
| GESGesves | 130.8 | 104 | 11:01:38.77+22.92 s | 11:01:54.53+38.68 s | 15.76 |
| CLAClavier | 144.7 | 101 | 11:01:40.52+24.67 s | 11:01:59.06+43.21 s | 18.54 |
| RCHRochefort | 149.0 | 113 | 11:01:40.12+24.27 s | 11:01:58.19+42.34 s | 18.07 |