NAMECHE (BE)
Quarry blast23 May 2017
- Magnitude
- 1.2ML
- Depth
- 9.8km ± 5.5
- Belgian time
- 14:13:422017-05-23
- UTC
- 12:13:422017-05-23
Main parameters
| Date and time | 2017-05-23 12:13:42 UTC 2017-05-23 14:13:42 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.475° N, 4.989° E Uncertainty ± 3.5 km |
| Depth of hypocenter | 9.8 ± 5.5 km |
| Event ID | ROB 5725 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-05-24 08:49:58 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
- 9
- Epicentral distance
- 12.2 – 122.7km
- Mean velocity, P wave
- 6.2km/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 9.8 km. P wave: 8 measurements, root-mean-square deviation 0.88 s. S wave: 4 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)9 stations | ||||||
| GESGesves | 12.2 | 145 | 12:13:44.07+1.90 s | – | – | – |
| CLAClavier | 23.1 | 105 | 12:13:46.13+3.96 s | 12:13:49.67+7.50 s | 3.54 | 20.0 |
| MRDMaredsous | 24.8 | 219 | 12:13:46.41+4.24 s | 12:13:50.60+8.43 s | 4.19 | – |
| RCHRochefort | 39.4 | 154 | 12:13:49.08+6.91 s | – | – | – |
| STISart Tilman | 42.5 | 73 | 12:13:49.33+7.16 s | – | – | – |
| SKQSteenkerque | 67.3 | 287 | 12:13:51.02+8.85 s | – | – | – |
| HOUHouvegnez | 73.5 | 100 | 12:13:54.99+12.82 s | 12:14:03.54+21.37 s | 8.55 | – |
| MEMHMembach | 73.9 | 78 | 12:13:54.85+12.68 s | 12:14:04.54+22.37 s | 9.69 | – |
| WLFWalferdange | 122.7 | 137 | 12:14:02.84+20.67 s | – | – | – |