ARBREFONTAINE (BE)
Quarry blast30 April 2018
- Magnitude
- 1.3ML
- Depth
- 1.1km ± 3.4
- Belgian time
- 13:51:062018-04-30
- UTC
- 11:51:062018-04-30
Main parameters
| Date and time | 2018-04-30 11:51:06 UTC 2018-04-30 13:51:06 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.279° N, 5.826° E Uncertainty ± 0.9 km |
| Depth of hypocenter | 1.1 ± 3.4 km |
| Event ID | ROB 6545 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-05-02 09:45:16 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
- 10
- Epicentral distance
- 15.3 – 130.6km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.5km/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. Hypocenter at a depth of 1.1 km. P wave: 9 measurements, root-mean-square deviation 0.27 s. S wave: 7 measurements, root-mean-square deviation 0.42 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 | nm | |
|---|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)10 stations | ||||||
| HOUHouvegnez | 15.3 | 57 | 11:51:09.29+2.46 s | 11:51:10.99+4.16 s | 1.70 | – |
| MRGMont Rigi | 31.3 | 34 | 11:51:12.23+5.40 s | 11:51:15.71+8.88 s | 3.48 | – |
| MEMHMembach | 39.0 | 20 | 11:51:13.89+7.06 s | 11:51:18.70+11.87 s | 4.81 | – |
| CLAClavier | 40.4 | 293 | 11:51:14.19+7.36 s | 11:51:17.81+10.98 s | 3.62 | – |
| TNLTernell | 40.5 | 32 | 11:51:13.93+7.10 s | – | – | – |
| RCHRochefort | 44.9 | 252 | 11:51:14.74+7.91 s | 11:51:20.14+13.31 s | 5.40 | 15.0 |
| VIAVianden | 46.7 | 145 | 11:51:14.97+8.14 s | 11:51:20.74+13.91 s | 5.77 | – |
| WLFWalferdange | 72.2 | 161 | 11:51:19.62+12.79 s | 11:51:27.69+20.86 s | 8.07 | – |
| DOUDourbes | 90.3 | 257 | 11:51:21.88+15.05 s | – | – | – |
| SKQSteenkerque | 130.6 | 289 | 11:51:29.46+22.63 s | 11:51:45.88+39.05 s | 16.42 | 3.0 |