HOLZTHUM (LU)
Quarry blast17 July 2020
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 16:20:442020-07-17
- UTC
- 14:20:442020-07-17
Main parameters
| Date and time | 2020-07-17 14:20:44 UTC 2020-07-17 16:20:44 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 49.983° N, 6.071° E Uncertainty ± 0.7 km |
| Event ID | ROB 10515 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-07-17 23:57:25 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
- 10.8 – 106.5km
- 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 0.36 s. S wave: 7 measurements, root-mean-square deviation 0.20 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)9 stations | |||||
| VIAVianden | 10.8 | 119 | 14:20:46.71+2.28 s | 14:20:47.86+3.43 s | 1.15 |
| KLBKalborn | 13.3 | 12 | 14:20:47.13+2.70 s | 14:20:49.09+4.66 s | 1.96 |
| HOUHouvegnez | 41.6 | 353 | 14:20:51.90+7.47 s | – | – |
| MRGMont Rigi | 58.8 | 0 | 14:20:54.87+10.44 s | 14:21:02.28+17.85 s | 7.41 |
| RCHRochefort | 63.4 | 288 | 14:20:54.87+10.44 s | 14:21:03.55+19.12 s | 8.68 |
| MEMHMembach | 69.8 | 356 | 14:20:56.94+12.51 s | 14:21:05.32+20.89 s | 8.38 |
| CLAClavier | 73.3 | 312 | 14:20:56.56+12.13 s | 14:21:06.21+21.78 s | 9.65 |
| GESGesves | 83.3 | 303 | 14:20:58.82+14.39 s | 14:21:08.90+24.47 s | 10.08 |
| DOUDourbes | 106.5 | 277 | 14:21:02.06+17.63 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 87.5 | 354 | 14:20:59.89+15.46 s | – | – |