DEUX-ACREN (BE)
Quarry blast17 July 2018
- Magnitude
- 1.1ML
- Depth
- 5.0km ± 7.7
- Belgian time
- 12:33:452018-07-17
- UTC
- 10:33:452018-07-17
Main parameters
| Date and time | 2018-07-17 10:33:45 UTC 2018-07-17 12:33:45 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.746° N, 3.845° E Uncertainty ± 8.7 km |
| Depth of hypocenter | 5.0 ± 7.7 km |
| Event ID | ROB 6975 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-07-18 08:48:05 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 – 153.8km
- Mean velocity, P wave
- 5.3km/s
- Mean velocity, S wave
- 3.4km/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 5.0 km. P wave: 6 measurements, root-mean-square deviation 0.47 s. S wave: 4 measurements, root-mean-square deviation 0.80 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)7 stations | ||||||
| LESLessines | 4.0 | 182 | 10:33:45.59+0.52 s | – | – | – |
| SKQSteenkerque | 19.8 | 123 | 10:33:48.30+3.23 s | 10:33:50.74+5.67 s | 2.44 | – |
| RQRRonquières | 31.1 | 120 | 10:33:49.82+4.75 s | – | – | – |
| DOUDourbes | 90.0 | 143 | 10:34:01.87+16.80 s | 10:34:11.13+26.06 s | 9.26 | – |
| GESGesves | 96.8 | 114 | 10:34:03.27+18.20 s | 10:34:14.29+29.22 s | 11.02 | – |
| CLAClavier | 109.5 | 109 | 10:34:04.38+19.31 s | 10:34:15.79+30.72 s | 11.41 | 3.0 |
| MEMHMembach | 153.8 | 95 | 10:34:09.37+24.30 s | 10:34:27.30+42.23 s | 17.93 | – |