LESSINES (BE)
Quarry blast6 September 2019
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 11:40:022019-09-06
- UTC
- 09:40:022019-09-06
Main parameters
| Date and time | 2019-09-06 09:40:02 UTC 2019-09-06 11:40:02 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.721° N, 3.823° E Uncertainty ± 3.9 km |
| Event ID | ROB 8615 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-09-06 12:50:50 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
- 19.8 – 176.5km
- Mean velocity, P wave
- 5.2km/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: 7 measurements, root-mean-square deviation 0.56 s. S wave: 5 measurements, root-mean-square deviation 0.39 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 | |||||
| SKQSteenkerque | 19.8 | 114 | 09:40:05.64+2.69 s | 09:40:07.98+5.03 s | 2.34 |
| BRQBracquegnies | 34.7 | 140 | 09:40:08.54+5.59 s | – | – |
| UCCBUccle | 38.8 | 77 | 09:40:09.80+6.85 s | – | – |
| DOUDourbes | 88.6 | 141 | 09:40:20.24+17.29 s | 09:40:29.11+26.16 s | 8.87 |
| GESGesves | 97.0 | 112 | 09:40:20.93+17.98 s | 09:40:32.44+29.49 s | 11.51 |
| CLAClavier | 110.0 | 107 | 09:40:22.76+19.81 s | 09:40:35.76+32.81 s | 13.00 |
| RCHRochefort | 117.9 | 122 | 09:40:24.02+21.07 s | 09:40:37.63+34.68 s | 13.61 |
| OPTBOpitter | 134.7 | 70 | 09:40:25.47+22.52 s | – | – |
| MEMSMembach | 155.1 | 94 | 09:40:28.65+25.70 s | – | – |
| MEMHMembach | 155.1 | 94 | 09:40:28.80+25.85 s | 09:40:47.65+44.70 s | 18.85 |
| MRGMont Rigi | 161.1 | 97 | 09:40:29.72+26.77 s | – | – |
| KLBKalborn | 176.5 | 112 | 09:40:31.77+28.82 s | 09:40:52.34+49.39 s | 20.57 |
| Dutch seismic network (KNMI)2 stations | |||||
| VKBValkenburg | 139.3 | 83 | 09:40:26.90+23.95 s | 09:40:44.28+41.33 s | 17.38 |
| HGNHeimansgroeve | 148.9 | 87 | 09:40:28.16+25.21 s | – | – |