PECQ (BE)
Quarry blast24 February 2020
- Magnitude
- 2.3ML
- Depth
- –
- Belgian time
- 13:00:432020-02-24
- UTC
- 12:00:432020-02-24
Main parameters
| Date and time | 2020-02-24 12:00:43 UTC 2020-02-24 13:00:43 Belgian time |
|---|---|
| Magnitude | ML 2.3 |
| Epicentral coordinates | 50.682° N, 3.365° E Uncertainty ± 2.0 km |
| Event ID | ROB 9315 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-02-24 13:40:41 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
- 14
- Epicentral distance
- 33.9 – 181.5km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.3km/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: 8 measurements, root-mean-square deviation 0.35 s. S wave: 5 measurements, root-mean-square deviation 0.86 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)12 stations | |||||
| LESLessines | 33.9 | 84 | 12:00:50.38+6.49 s | 12:00:54.63+10.74 s | 4.25 |
| SKQSteenkerque | 50.7 | 94 | 12:00:52.95+9.06 s | 12:00:58.17+14.28 s | 5.22 |
| BOUBougnies | 52.5 | 128 | 12:00:52.38+8.49 s | – | – |
| ZEVZevekote | 60.2 | 327 | 12:00:54.32+10.43 s | – | – |
| RQRRonquières | 61.4 | 98 | 12:00:54.76+10.87 s | 12:01:01.98+18.09 s | 7.22 |
| TGATangissart | 82.3 | 96 | 12:00:58.04+14.15 s | – | – |
| MRDMaredsous | 108.2 | 112 | 12:01:02.27+18.38 s | 12:01:17.93+34.04 s | 15.66 |
| DOUDourbes | 109.2 | 126 | 12:01:02.65+18.76 s | 12:01:16.31+32.42 s | 13.66 |
| GESGesves | 126.5 | 105 | 12:01:05.47+21.58 s | 12:01:21.30+37.41 s | 15.83 |
| CLAClavier | 140.4 | 101 | 12:01:08.12+24.23 s | 12:01:25.47+41.58 s | 17.35 |
| RCHRochefort | 144.8 | 113 | 12:01:08.42+24.53 s | 12:01:25.68+41.79 s | 17.26 |
| OPTOpitter | 166.8 | 72 | 12:01:10.97+27.08 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 181.5 | 86 | 12:01:13.66+29.77 s | – | – |
| VITO (Mol)1 station | |||||
| RETGVRetie | 137* | – | 12:01:08.46+24.57 s | – | – |
* Distance from the catalogue, rounded to the kilometre: the coordinates of the station are missing from it.