DEUX-ACREN (BE)
Quarry blast12 May 2017
- Magnitude
- 1.7ML
- Depth
- 8.0km ± 3.0
- Belgian time
- 11:35:402017-05-12
- UTC
- 09:35:402017-05-12
Main parameters
| Date and time | 2017-05-12 09:35:40 UTC 2017-05-12 11:35:40 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.713° N, 3.858° E Uncertainty ± 3.1 km |
| Depth of hypocenter | 8.0 ± 3.0 km |
| Event ID | ROB 5699 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-05-12 12:02:24 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
- 14
- Epicentral distance
- 1.1 – 157.3km
- Mean velocity, P wave
- 5.5km/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 8.0 km. P wave: 11 measurements, root-mean-square deviation 0.40 s. S wave: 5 measurements, root-mean-square deviation 0.03 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 | nm | |
|---|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)14 stations | ||||||
| LESLessines | 1.1 | 257 | 09:35:40.60+0.26 s | – | – | – |
| SKQSteenkerque | 17.2 | 114 | 09:35:43.26+2.92 s | 09:35:45.42+5.08 s | 2.16 | – |
| RQRRonquières | 28.5 | 115 | 09:35:45.22+4.88 s | 09:35:48.51+8.17 s | 3.29 | – |
| BRQBracquegnies | 32.5 | 143 | 09:35:46.33+5.99 s | – | – | – |
| BOUBougnies | 36.6 | 170 | 09:35:47.19+6.85 s | – | – | – |
| SNFSeneffe | 37.6 | 127 | 09:35:46.59+6.25 s | – | – | – |
| MRDMaredsous | 79.1 | 125 | 09:35:54.04+13.70 s | – | – | – |
| DOUDourbes | 86.4 | 142 | 09:35:55.68+15.34 s | 09:36:05.25+24.91 s | 9.57 | – |
| DSLBDessel | 102.5 | 55 | 09:35:58.32+17.98 s | 09:36:09.92+29.58 s | 11.60 | – |
| CLAClavier | 107.4 | 107 | 09:35:58.64+18.30 s | 09:36:11.39+31.05 s | 12.75 | 13.8 |
| RCHRochefort | 115.4 | 122 | 09:36:01.22+20.88 s | – | – | – |
| STISart Tilman | 121.5 | 96 | 09:36:01.87+21.53 s | – | – | – |
| MEMHMembach | 152.6 | 94 | 09:36:04.42+24.08 s | 09:36:22.47+42.13 s | 18.05 | – |
| HOUHouvegnez | 157.3 | 104 | 09:36:06.07+25.73 s | 09:36:23.13+42.79 s | 17.06 | – |