OLNE (BE)
Quarry blast20 February 2020
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 15:12:402020-02-20
- UTC
- 14:12:402020-02-20
Main parameters
| Date and time | 2020-02-20 14:12:40 UTC 2020-02-20 15:12:40 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.585° N, 5.726° E Uncertainty ± 0.9 km |
| Event ID | ROB 9305 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-02-21 10:26:13 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
- 7
- Epicentral distance
- 10.9 – 35.3km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.1km/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: 7 measurements, root-mean-square deviation 0.20 s. S wave: 5 measurements, root-mean-square deviation 0.21 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 | |||||
| LCHLa Chartreuse | 10.9 | 304 | 14:12:41.74+1.59 s | 14:12:44.23+4.08 s | 2.49 |
| MEMHMembach | 20.3 | 82 | 14:12:43.78+3.63 s | 14:12:46.95+6.80 s | 3.17 |
| MEMSMembach | 20.3 | 82 | 14:12:43.84+3.69 s | – | – |
| EBNEben-Emael | 23.9 | 352 | 14:12:44.37+4.22 s | – | – |
| CLAClavier | 35.3 | 239 | 14:12:46.29+6.14 s | 14:12:51.41+11.26 s | 5.12 |
| Dutch seismic network (KNMI)2 stations | |||||
| HGNHeimansgroeve | 24.7 | 36 | 14:12:44.39+4.24 s | 14:12:48.16+8.01 s | 3.77 |
| VKBValkenburg | 31.6 | 7 | 14:12:45.86+5.71 s | 14:12:50.57+10.42 s | 4.71 |