LESSINES (BE)
Quarry blast29 May 2020
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 11:40:212020-05-29
- UTC
- 09:40:212020-05-29
Main parameters
| Date and time | 2020-05-29 09:40:21 UTC 2020-05-29 11:40:21 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.714° N, 3.858° E Uncertainty ± 1.2 km |
| Event ID | ROB 10135 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-05-29 17:02:35 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
- 6
- Epicentral distance
- 1.1 – 152.6km
- Mean velocity, P wave
- 5.3km/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: 5 measurements, root-mean-square deviation 1.18 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)6 stations | |||||
| LESLessines | 1.1 | 254 | 09:40:21.97+0.21 s | – | – |
| SKQSteenkerque | 17.2 | 115 | 09:40:24.69+2.93 s | 09:40:27.21+5.45 s | 2.52 |
| RQRRonquières | 28.6 | 115 | 09:40:26.59+4.83 s | – | – |
| BOUBougnies | 36.6 | 170 | 09:40:31.25+9.49 s | – | – |
| DOUDourbes | 86.5 | 142 | 09:40:37.65+15.89 s | 09:40:47.76+26.00 s | 10.11 |
| MEMHMembach | 152.6 | 94 | 09:40:48.13+26.37 s | 09:41:07.10+45.34 s | 18.97 |