HOLZTHUM (LU)
Quarry blast22 September 2021
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 13:29:572021-09-22
- UTC
- 11:29:572021-09-22
Main parameters
| Date and time | 2021-09-22 11:29:57 UTC 2021-09-22 13:29:57 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 49.986° N, 6.068° E Uncertainty ± 0.9 km |
| Event ID | ROB 14465 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-23 13:59:30 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
- 6
- Epicentral distance
- 11.1 – 83.0km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.5km/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: 6 measurements, root-mean-square deviation 0.22 s. S wave: 6 measurements, root-mean-square deviation 0.29 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 | |||||
| VIAVianden | 11.1 | 120 | 11:30:00.00+2.07 s | 11:30:01.92+3.99 s | 1.92 |
| KLBKalborn | 13.0 | 13 | 11:30:00.44+2.51 s | 11:30:02.64+4.71 s | 2.20 |
| HOUHouvegnez | 41.2 | 354 | 11:30:05.25+7.32 s | 11:30:10.66+12.73 s | 5.41 |
| MRGMont Rigi | 58.4 | 0 | 11:30:08.28+10.35 s | 11:30:15.47+17.54 s | 7.19 |
| MEMHMembach | 69.4 | 357 | 11:30:10.17+12.24 s | 11:30:18.01+20.08 s | 7.84 |
| GESGesves | 83.0 | 303 | 11:30:12.65+14.72 s | 11:30:22.31+24.38 s | 9.66 |