LONTZEN (BE)
Quarry blast16 March 2021
- Magnitude
- 0.7ML
- Depth
- –
- Belgian time
- 12:43:462021-03-16
- UTC
- 11:43:462021-03-16
Main parameters
| Date and time | 2021-03-16 11:43:46 UTC 2021-03-16 12:43:46 Belgian time |
|---|---|
| Magnitude | ML 0.7 |
| Epicentral coordinates | 50.664° N, 6.038° E Uncertainty ± 0.7 km |
| Event ID | ROB 12770 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-03-18 14:04:24 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
- 6.5 – 17.2km
- Mean velocity, P wave
- 5.4km/s
- Mean velocity, S wave
- 2.8km/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 0.09 s. S wave: 6 measurements, root-mean-square deviation 0.14 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)4 stations | |||||
| MEMHMembach | 6.5 | 198 | 11:43:47.44+1.05 s | 11:43:48.93+2.54 s | 1.49 |
| MEMSMembach | 6.5 | 198 | 11:43:47.51+1.12 s | 11:43:48.70+2.31 s | 1.19 |
| TNLTernell | 10.8 | 143 | 11:43:48.43+2.04 s | 11:43:50.26+3.87 s | 1.83 |
| MRGMont Rigi | 17.2 | 171 | 11:43:49.60+3.21 s | 11:43:52.52+6.13 s | 2.92 |
| Dutch seismic network (KNMI)2 stations | |||||
| HGNHeimansgroeve | 13.4 | 326 | 11:43:48.94+2.55 s | 11:43:51.18+4.79 s | 2.24 |
| TERZTerziet | 13.9 | 318 | 11:43:49.07+2.68 s | 11:43:51.07+4.68 s | 2.00 |