OLNE (BE)
Quarry blast18 August 2020
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 14:33:012020-08-18
- UTC
- 12:33:012020-08-18
Main parameters
| Date and time | 2020-08-18 12:33:01 UTC 2020-08-18 14:33:01 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.598° N, 5.713° E Uncertainty ± 0.5 km |
| Event ID | ROB 10700 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-08-18 17:20:57 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
- 9.3 – 35.3km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.2km/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 0.15 s. S wave: 6 measurements, root-mean-square deviation 0.36 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 | |||||
| LCHLa Chartreuse | 9.3 | 299 | 12:33:03.17+1.53 s | 12:33:04.82+3.18 s | 1.65 |
| MEMHMembach | 21.0 | 87 | 12:33:05.31+3.67 s | 12:33:08.66+7.02 s | 3.35 |
| EBNEben-Emael | 22.3 | 354 | 12:33:05.78+4.14 s | – | – |
| MRGMont Rigi | 27.4 | 111 | 12:33:06.46+4.82 s | 12:33:10.67+9.03 s | 4.21 |
| HOUHouvegnez | 34.1 | 143 | 12:33:07.51+5.87 s | 12:33:11.90+10.26 s | 4.39 |
| CLAClavier | 35.3 | 236 | 12:33:07.89+6.25 s | 12:33:13.06+11.42 s | 5.17 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 24.0 | 40 | 12:33:05.88+4.24 s | 12:33:09.92+8.28 s | 4.04 |