LESSINES (BE)
Quarry blast12 September 2019
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:40:592019-09-12
- UTC
- 10:40:592019-09-12
Main parameters
| Date and time | 2019-09-12 10:40:59 UTC 2019-09-12 12:40:59 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.713° N, 3.845° E Uncertainty ± 4.9 km |
| Event ID | ROB 8655 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-09-16 09:22:04 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
- 9
- Epicentral distance
- 0.3 – 153.5km
- Mean velocity, P wave
- 5.5km/s
- Mean velocity, S wave
- 3.4km/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 0.28 s. S wave: 5 measurements, root-mean-square deviation 0.42 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)9 stations | |||||
| LESLessines | 0.3 | 208 | 10:40:59.09+0.09 s | 10:40:59.30+0.30 s | 0.21 |
| RQRRonquières | 29.4 | 114 | 10:41:03.65+4.65 s | – | – |
| BRQBracquegnies | 33.0 | 141 | 10:41:04.59+5.59 s | – | – |
| DOUDourbes | 87.0 | 142 | 10:41:14.36+15.36 s | 10:41:24.02+25.02 s | 9.66 |
| GESGesves | 95.3 | 112 | 10:41:16.42+17.42 s | 10:41:26.74+27.74 s | 10.32 |
| CLAClavier | 108.3 | 107 | 10:41:18.46+19.46 s | 10:41:31.23+32.23 s | 12.77 |
| RCHRochefort | 116.2 | 122 | 10:41:19.63+20.63 s | 10:41:33.64+34.64 s | 14.01 |
| MEMSMembach | 153.5 | 93 | 10:41:23.90+24.90 s | – | – |
| MEMHMembach | 153.5 | 93 | 10:41:23.90+24.90 s | 10:41:44.01+45.01 s | 20.11 |