FRASNES-LEZ-ANVAING (BE)
Quarry blast31 May 2018
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 13:00:592018-05-31
- UTC
- 11:00:592018-05-31
Main parameters
| Date and time | 2018-05-31 11:00:59 UTC 2018-05-31 13:00:59 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.663° N, 3.560° E Uncertainty ± 1.1 km |
| Event ID | ROB 6685 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-05-31 13:13:50 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
- 36.8 – 371.4km
- Mean velocity, P wave
- 5.9km/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: 8 measurements, root-mean-square deviation 0.23 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)10 stations | |||||
| SKQSteenkerque | 36.8 | 92 | 11:01:06.43+6.69 s | – | – |
| BOUBougnies | 40.9 | 138 | 11:01:06.26+6.52 s | – | – |
| BRQBracquegnies | 45.6 | 116 | 11:01:07.63+7.89 s | – | – |
| RQRRonquières | 47.5 | 97 | 11:01:07.85+8.11 s | – | – |
| UCCSUccle | 58.4 | 75 | 11:01:09.87+10.13 s | 11:01:17.06+17.32 s | 7.19 |
| ZEVZevekote | 70.3 | 319 | 11:01:11.86+12.12 s | – | – |
| DOUDourbes | 97.0 | 130 | 11:01:16.16+16.42 s | 11:01:28.71+28.97 s | 12.55 |
| GESGesves | 112.6 | 105 | 11:01:18.95+19.21 s | – | – |
| HOUHouvegnez | 176.8 | 100 | 11:01:28.83+29.09 s | 11:01:50.11+50.37 s | 21.28 |
| KLBKalborn | 191.8 | 108 | 11:01:30.88+31.14 s | – | – |
| Network STR1 station | |||||
| WLSWelschbruch | 371.4 | 131 | 11:01:54.18+54.44 s | – | – |