DEUX-ACREN (BE)
Quarry blast12 September 2019
- Magnitude
- 1.5ML
- Depth
- 3.5km ± 3.7
- Belgian time
- 12:40:582019-09-12
- UTC
- 10:40:582019-09-12
Main parameters
| Date and time | 2019-09-12 10:40:58 UTC 2019-09-12 12:40:58 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.743° N, 3.847° E Uncertainty ± 3.3 km |
| Depth of hypocenter | 3.5 ± 3.7 km |
| Event ID | ROB 8640 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-09-12 13:04:57 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
- 12
- Epicentral distance
- 3.6 – 175.9km
- Mean velocity, P wave
- 5.7km/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 3.5 km. P wave: 9 measurements, root-mean-square deviation 0.51 s. S wave: 4 measurements, root-mean-square deviation 0.55 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)12 stations | ||||||
| LESLessines | 3.6 | 185 | 10:40:59.07+0.90 s | – | – | – |
| SKQSteenkerque | 19.5 | 122 | 10:41:01.73+3.56 s | 10:41:03.96+5.79 s | 2.23 | – |
| RQRRonquières | 30.7 | 120 | 10:41:03.50+5.33 s | 10:41:06.95+8.78 s | 3.45 | – |
| BRQBracquegnies | 35.6 | 145 | 10:41:04.62+6.45 s | – | – | – |
| UCCBUccle | 36.7 | 80 | 10:41:03.74+5.57 s | – | – | – |
| DOUDourbes | 89.6 | 143 | 10:41:14.08+15.91 s | 10:41:23.46+25.29 s | 9.38 | – |
| GESGesves | 96.4 | 114 | 10:41:14.19+16.02 s | – | – | – |
| CLAClavier | 109.2 | 109 | 10:41:16.95+18.78 s | 10:41:30.73+32.56 s | 13.78 | 0.0 |
| RCHRochefort | 117.8 | 123 | 10:41:19.65+21.48 s | – | – | – |
| MEMHMembach | 153.6 | 95 | 10:41:23.80+25.63 s | – | – | – |
| HOUHouvegnez | 158.9 | 105 | 10:41:24.04+25.87 s | – | – | – |
| KLBKalborn | 175.9 | 113 | 10:41:26.15+27.98 s | – | – | – |