LESSINES (BE)
Quarry blast26 April 2018
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 14:34:152018-04-26
- UTC
- 12:34:152018-04-26
Main parameters
| Date and time | 2018-04-26 12:34:15 UTC 2018-04-26 14:34:15 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.740° N, 3.876° E Uncertainty ± 4.5 km |
| Event ID | ROB 6535 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-04-27 09:49:52 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
- 7
- Epicentral distance
- 4.0 – 130.5km
- Mean velocity, P wave
- 6.0km/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: 6 measurements, root-mean-square deviation 0.25 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)7 stations | |||||
| LESLessines | 4.0 | 216 | 12:34:16.38+0.60 s | – | – |
| SKQSteenkerque | 17.6 | 125 | 12:34:19.03+3.25 s | 12:34:20.99+5.21 s | 1.96 |
| RQRRonquières | 28.8 | 121 | 12:34:20.79+5.01 s | – | – |
| BRQBracquegnies | 34.2 | 147 | 12:34:22.05+6.27 s | – | – |
| DOUDourbes | 88.1 | 144 | 12:34:31.08+15.30 s | 12:34:42.23+26.45 s | 11.15 |
| CLAClavier | 107.1 | 109 | 12:34:33.67+17.89 s | – | – |
| OPTOpitter | 130.5 | 71 | 12:34:38.11+22.33 s | – | – |