LESSINES (BE)
Quarry blast9 May 2019
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 13:11:472019-05-09
- UTC
- 11:11:472019-05-09
Main parameters
| Date and time | 2019-05-09 11:11:47 UTC 2019-05-09 13:11:47 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.713° N, 3.856° E Uncertainty ± 2.0 km |
| Event ID | ROB 8135 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-05-09 13:29:30 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
- 11
- Epicentral distance
- 0.9 – 152.8km
- Mean velocity, P wave
- 5.6km/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: 10 measurements, root-mean-square deviation 0.43 s. S wave: 7 measurements, root-mean-square deviation 0.78 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)11 stations | |||||
| LESLessines | 0.9 | 256 | 11:11:47.75+0.25 s | 11:11:47.95+0.45 s | 0.20 |
| SKQSteenkerque | 17.4 | 114 | 11:11:50.36+2.86 s | 11:11:52.76+5.26 s | 2.40 |
| RQRRonquières | 28.7 | 114 | 11:11:52.30+4.80 s | – | – |
| BRQBracquegnies | 32.6 | 142 | 11:11:53.48+5.98 s | – | – |
| BOUBougnies | 36.6 | 170 | 11:11:53.83+6.33 s | – | – |
| UCCBUccle | 36.8 | 75 | 11:11:54.49+6.99 s | 11:11:57.86+10.36 s | 3.37 |
| ZEVZevekote | 82.1 | 305 | 11:12:01.96+14.46 s | 11:12:11.95+24.45 s | 9.99 |
| DOUDourbes | 86.5 | 142 | 11:12:03.72+16.22 s | 11:12:12.68+25.18 s | 8.96 |
| OSTBOostende | 86.9 | 313 | 11:12:02.50+15.00 s | 11:12:12.52+25.02 s | 10.02 |
| CLAClavier | 107.6 | 107 | 11:12:05.89+18.39 s | 11:12:21.23+33.73 s | 15.34 |
| MEMHMembach | 152.8 | 94 | 11:12:13.55+26.05 s | 11:12:32.59+45.09 s | 19.04 |