HAM-SUR-MEUSE (FR)
Quarry blast28 July 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 12:07:002020-07-28
- UTC
- 10:07:002020-07-28
Main parameters
| Date and time | 2020-07-28 10:07:00 UTC 2020-07-28 12:07:00 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.096° N, 4.796° E Uncertainty ± 2.1 km |
| Event ID | ROB 10550 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-07-28 14:40:32 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
- 14.4 – 63.6km
- Mean velocity, P wave
- 7.4km/s
- Mean velocity, S wave
- 3.6km/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 0.26 s. S wave: 5 measurements, root-mean-square deviation 0.31 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 | |||||
| DOUDourbes | 14.4 | 270 | 10:07:03.45+2.96 s | 10:07:05.78+5.29 s | 2.33 |
| MRDMaredsous | 23.0 | 355 | 10:07:05.00+4.51 s | 10:07:08.62+8.13 s | 3.62 |
| RCHRochefort | 31.5 | 78 | 10:07:05.78+5.29 s | 10:07:10.65+10.16 s | 4.87 |
| GESGesves | 38.2 | 33 | 10:07:07.26+6.77 s | 10:07:12.77+12.28 s | 5.51 |
| CLAClavier | 50.9 | 45 | 10:07:09.08+8.59 s | 10:07:15.51+15.02 s | 6.43 |
| BRQBracquegnies | 63.6 | 313 | 10:07:10.34+9.85 s | – | – |