OLNE (BE)
Quarry blast30 July 2020
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 11:55:132020-07-30
- UTC
- 09:55:132020-07-30
Main parameters
| Date and time | 2020-07-30 09:55:13 UTC 2020-07-30 11:55:13 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.592° N, 5.723° E Uncertainty ± 0.4 km |
| Event ID | ROB 10570 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-07-30 12:17:22 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
- 9
- Epicentral distance
- 10.2 – 61.2km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.3km/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: 9 measurements, root-mean-square deviation 0.21 s. S wave: 8 measurements, root-mean-square deviation 0.33 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)7 stations | |||||
| LCHLa Chartreuse | 10.2 | 301 | 09:55:14.84+1.59 s | 09:55:16.70+3.45 s | 1.86 |
| MEMHMembach | 20.4 | 85 | 09:55:16.92+3.67 s | 09:55:19.97+6.72 s | 3.05 |
| EBNEben-Emael | 23.0 | 352 | 09:55:17.22+3.97 s | – | – |
| MRGMont Rigi | 26.5 | 110 | 09:55:17.99+4.74 s | 09:55:21.84+8.59 s | 3.85 |
| CLAClavier | 35.5 | 237 | 09:55:19.32+6.07 s | 09:55:24.77+11.52 s | 5.45 |
| GESGesves | 50.6 | 243 | 09:55:22.09+8.84 s | 09:55:28.90+15.65 s | 6.81 |
| KLBKalborn | 61.2 | 153 | 09:55:23.96+10.71 s | 09:55:31.43+18.18 s | 7.47 |
| Dutch seismic network (KNMI)2 stations | |||||
| HGNHeimansgroeve | 24.2 | 38 | 09:55:17.53+4.28 s | 09:55:21.23+7.98 s | 3.70 |
| VKBValkenburg | 30.9 | 8 | 09:55:18.77+5.52 s | 09:55:23.29+10.04 s | 4.52 |