LESSINES (BE)
Quarry blast14 August 2019
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 12:41:232019-08-14
- UTC
- 10:41:232019-08-14
Main parameters
| Date and time | 2019-08-14 10:41:23 UTC 2019-08-14 12:41:23 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.728° N, 3.805° E Uncertainty ± 1.7 km |
| Event ID | ROB 8535 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-08-14 12:59:55 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
- 19
- Epicentral distance
- 21.3 – 178.0km
- 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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 9 measurements, root-mean-square deviation 0.49 s. S wave: 6 measurements, root-mean-square deviation 0.51 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)17 stations | |||||
| SKQSteenkerque | 21.3 | 114 | 10:41:26.62+3.05 s | 10:41:28.30+4.73 s | 1.68 |
| RQRRonquières | 32.6 | 114 | 10:41:28.45+4.88 s | – | – |
| BRQBracquegnies | 36.1 | 139 | 10:41:29.81+6.24 s | – | – |
| UCCSUccle | 39.9 | 79 | 10:41:30.54+6.97 s | – | – |
| UCCBUccle | 39.9 | 79 | 10:41:30.86+7.29 s | 10:41:34.98+11.41 s | 4.12 |
| OSTBOostende | 83.2 | 313 | 10:41:37.03+13.46 s | 10:41:48.80+25.23 s | 11.77 |
| DOUDourbes | 90.1 | 141 | 10:41:39.35+15.78 s | 10:41:50.39+26.82 s | 11.04 |
| CLAClavier | 111.5 | 107 | 10:41:43.03+19.46 s | 10:41:57.45+33.88 s | 14.42 |
| RCHRochefort | 119.4 | 122 | 10:41:44.77+21.20 s | 10:41:59.07+35.50 s | 14.30 |
| LCHLa Chartreuse | 127.2 | 94 | 10:41:45.98+22.41 s | – | – |
| EBNEben-Emael | 132.3 | 86 | 10:41:47.04+23.47 s | – | – |
| OPTBOpitter | 135.6 | 71 | 10:41:47.31+23.74 s | – | – |
| MEMSMembach | 156.4 | 94 | 10:41:49.78+26.21 s | – | – |
| MEMHMembach | 156.4 | 94 | 10:41:49.81+26.24 s | 10:42:08.37+44.80 s | 18.56 |
| HOUHouvegnez | 161.4 | 104 | 10:41:50.28+26.71 s | – | – |
| MRGMont Rigi | 162.4 | 98 | 10:41:50.66+27.09 s | 10:42:10.84+47.27 s | 20.18 |
| KLBKalborn | 178.0 | 112 | 10:41:52.69+29.12 s | 10:42:13.30+49.73 s | 20.61 |
| Dutch seismic network (KNMI)2 stations | |||||
| VKBValkenburg | 140.4 | 83 | 10:41:47.71+24.14 s | – | – |
| HGNHeimansgroeve | 150.1 | 88 | 10:41:48.71+25.14 s | 10:42:07.05+43.48 s | 18.34 |