LESSINES (BE)
Quarry blast24 April 2019
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:40:312019-04-24
- UTC
- 10:40:312019-04-24
Main parameters
| Date and time | 2019-04-24 10:40:31 UTC 2019-04-24 12:40:31 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.704° N, 3.864° E Uncertainty ± 1.4 km |
| Event ID | ROB 8065 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-04-24 13:03:10 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
- 13
- Epicentral distance
- 1.7 – 156.7km
- Mean velocity, P wave
- 5.5km/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 0.38 s. S wave: 7 measurements, root-mean-square deviation 1.03 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 | |||||
| LESLessines | 1.7 | 299 | 10:40:31.68+0.17 s | 10:40:31.91+0.40 s | 0.23 |
| SKQSteenkerque | 16.4 | 112 | 10:40:34.34+2.83 s | 10:40:36.39+4.88 s | 2.05 |
| RQRRonquières | 27.8 | 113 | 10:40:36.20+4.69 s | – | – |
| BRQBracquegnies | 31.4 | 142 | 10:40:37.36+5.85 s | – | – |
| UCCBUccle | 36.5 | 73 | 10:40:37.06+5.55 s | 10:40:41.89+10.38 s | 4.83 |
| DOUDourbes | 85.4 | 142 | 10:40:46.80+15.29 s | 10:40:56.54+25.03 s | 9.74 |
| OSTBOostende | 88.0 | 313 | 10:40:46.67+15.16 s | – | – |
| GESGesves | 93.7 | 112 | 10:40:48.00+16.49 s | 10:40:59.04+27.53 s | 11.04 |
| DSLBDessel | 102.8 | 55 | 10:40:49.90+18.39 s | 10:41:02.03+30.52 s | 12.13 |
| MEMHMembach | 152.1 | 93 | 10:40:57.31+25.80 s | 10:41:15.52+44.01 s | 18.21 |
| MEMSMembach | 152.1 | 93 | 10:40:57.31+25.80 s | – | – |
| HOUHouvegnez | 156.7 | 104 | 10:40:58.40+26.89 s | 10:41:16.27+44.76 s | 17.87 |
| VITO (Mol)1 station | |||||
| MOL2AMol | 103* | – | 10:40:50.40+18.89 s | 10:41:05.06+33.55 s | 14.66 |
* Distance from the catalogue, rounded to the kilometre: the coordinates of the station are missing from it.