OLNE (BE)
Quarry blast7 April 2020
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 13:30:282020-04-07
- UTC
- 11:30:282020-04-07
Main parameters
| Date and time | 2020-04-07 11:30:28 UTC 2020-04-07 13:30:28 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.603° N, 5.719° E Uncertainty ± 0.8 km |
| Event ID | ROB 9770 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-04-07 15:02:46 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
- 10
- Epicentral distance
- 9.4 – 62.5km
- Mean velocity, P wave
- 6.1km/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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 10 measurements, root-mean-square deviation 0.34 s. S wave: 6 measurements, root-mean-square deviation 0.39 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)8 stations | |||||
| LCHLa Chartreuse | 9.4 | 295 | 11:30:29.91+1.70 s | 11:30:31.43+3.22 s | 1.52 |
| MEMHMembach | 20.6 | 88 | 11:30:31.75+3.54 s | 11:30:35.28+7.07 s | 3.53 |
| EBNEben-Emael | 21.7 | 352 | 11:30:32.93+4.72 s | – | – |
| MRGMont Rigi | 27.3 | 112 | 11:30:33.01+4.80 s | – | – |
| HOUHouvegnez | 34.4 | 144 | 11:30:34.29+6.08 s | – | – |
| CLAClavier | 36.0 | 235 | 11:30:34.28+6.07 s | 11:30:39.65+11.44 s | 5.37 |
| GESGesves | 51.0 | 242 | 11:30:37.43+9.22 s | – | – |
| KLBKalborn | 62.5 | 153 | 11:30:39.29+11.08 s | 11:30:46.58+18.37 s | 7.29 |
| Dutch seismic network (KNMI)2 stations | |||||
| HGNHeimansgroeve | 23.3 | 40 | 11:30:32.35+4.14 s | 11:30:36.08+7.87 s | 3.73 |
| VKBValkenburg | 29.7 | 9 | 11:30:33.89+5.68 s | 11:30:37.13+8.92 s | 3.24 |