LA ROCHE-EN-ARDENNE (BE)
Quarry blast18 July 2017
- Magnitude
- 1.5ML
- Depth
- 9.6km ± 3.4
- Belgian time
- 14:12:072017-07-18
- UTC
- 12:12:072017-07-18
Main parameters
| Date and time | 2017-07-18 12:12:07 UTC 2017-07-18 14:12:07 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.200° N, 5.598° E Uncertainty ± 0.9 km |
| Depth of hypocenter | 9.6 ± 3.4 km |
| Event ID | ROB 5775 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-07-18 14:37:04 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
- 32.2 – 120.8km
- Mean velocity, P wave
- 7.0km/s
- Mean velocity, S wave
- 3.6km/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 9.6 km. P wave: 11 measurements, root-mean-square deviation 0.64 s. S wave: 6 measurements, root-mean-square deviation 0.30 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 | ||||||
| CLAClavier | 32.2 | 319 | 12:12:13.23+5.47 s | 12:12:17.46+9.70 s | 4.23 | 24.7 |
| HOUHouvegnez | 33.7 | 59 | 12:12:13.30+5.54 s | – | – | – |
| KLBKalborn | 38.2 | 107 | 12:12:14.35+6.59 s | – | – | – |
| GESGesves | 41.8 | 300 | 12:12:14.78+7.02 s | 12:12:20.45+12.69 s | 5.67 | – |
| STISart Tilman | 42.6 | 357 | 12:12:15.42+7.66 s | – | – | – |
| MRGMont Rigi | 48.4 | 44 | 12:12:15.93+8.17 s | – | – | – |
| LCHLa Chartreuse | 48.8 | 0 | 12:12:16.22+8.46 s | 12:12:22.65+14.89 s | 6.43 | – |
| VIAVianden | 52.3 | 124 | 12:12:17.03+9.27 s | 12:12:23.40+15.64 s | 6.37 | – |
| MEMHMembach | 54.1 | 33 | 12:12:16.95+9.19 s | 12:12:23.49+15.73 s | 6.54 | – |
| SNFSeneffe | 99.7 | 291 | 12:12:24.31+16.55 s | – | – | – |
| SKQSteenkerque | 118.9 | 295 | 12:12:24.45+16.69 s | 12:12:41.85+34.09 s | 17.40 | – |
| DSLBDessel | 120.8 | 342 | 12:12:28.03+20.27 s | – | – | – |