LA ROCHE-EN-ARDENNE (BE)
Quarry blast17 April 2018
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 14:09:552018-04-17
- UTC
- 12:09:552018-04-17
Main parameters
| Date and time | 2018-04-17 12:09:55 UTC 2018-04-17 14:09:55 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.196° N, 5.600° E Uncertainty ± 0.8 km |
| Event ID | ROB 6500 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-04-17 17:44:52 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
- 6
- Epicentral distance
- 32.7 – 72.7km
- Mean velocity, P wave
- 5.9km/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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 6 measurements, root-mean-square deviation 0.17 s.
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 | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)6 stations | |||||
| CLAClavier | 32.7 | 320 | 12:10:01.33+5.87 s | 12:10:05.61+10.15 s | 4.28 |
| HOUHouvegnez | 33.8 | 58 | 12:10:01.24+5.78 s | – | – |
| KLBKalborn | 37.9 | 106 | 12:10:02.45+6.99 s | 12:10:06.88+11.42 s | 4.43 |
| GESGesves | 42.2 | 300 | 12:10:03.05+7.59 s | 12:10:07.80+12.34 s | 4.75 |
| MEMSMembach | 54.4 | 32 | 12:10:05.18+9.72 s | – | – |
| DOUDourbes | 72.7 | 262 | 12:10:08.07+12.61 s | – | – |
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