ATH (BE)
Quarry blast4 October 2018
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 14:20:132018-10-04
- UTC
- 12:20:132018-10-04
Main parameters
| Date and time | 2018-10-04 12:20:13 UTC 2018-10-04 14:20:13 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.657° N, 3.860° E Uncertainty ± 8.4 km |
| Event ID | ROB 7200 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-10-04 14:37:22 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
- 5
- Epicentral distance
- 6.2 – 86.1km
- Mean velocity, P wave
- 6.4km/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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 5 measurements, root-mean-square deviation 0.54 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)5 stations | |||||
| LESLessines | 6.2 | 349 | 12:20:14.30+1.22 s | – | – |
| SKQSteenkerque | 15.6 | 93 | 12:20:17.01+3.93 s | – | – |
| BOUBougnies | 30.4 | 169 | 12:20:18.65+5.57 s | – | – |
| MRDMaredsous | 75.6 | 121 | 12:20:25.01+11.93 s | – | – |
| ZEVZevekote | 86.1 | 309 | 12:20:27.81+14.73 s | – | – |
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