FRASNES-LEZ-ANVAING (BE)
Quarry blast10 May 2021
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 13:03:172021-05-10
- UTC
- 11:03:172021-05-10
Main parameters
| Date and time | 2021-05-10 11:03:17 UTC 2021-05-10 13:03:17 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.682° N, 3.524° E Uncertainty ± 6.6 km |
| Event ID | ROB 13375 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-05-10 16:54:31 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
- 39.5 – 134.5km
- Mean velocity, P wave
- 6.0km/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: 7 measurements, root-mean-square deviation 0.17 s. S wave: 5 measurements, root-mean-square deviation 0.44 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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)10 stations | |||||
| SKQSteenkerque | 39.5 | 95 | 11:03:23.86+6.79 s | 11:03:29.58+12.51 s | 5.72 |
| BRQBracquegnies | 48.8 | 117 | 11:03:24.96+7.89 s | – | – |
| RQRRonquières | 50.3 | 99 | 11:03:25.70+8.63 s | – | – |
| SNFSeneffe | 57.1 | 109 | 11:03:26.48+9.41 s | 11:03:33.54+16.47 s | 7.06 |
| TGATangissart | 71.1 | 97 | 11:03:28.85+11.78 s | 11:03:38.12+21.05 s | 9.27 |
| DOUDourbes | 100.4 | 130 | 11:03:33.69+16.62 s | 11:03:47.09+30.02 s | 13.40 |
| GESGesves | 115.6 | 106 | 11:03:36.46+19.39 s | 11:03:51.94+34.87 s | 15.48 |
| DSLBDessel | 124.3 | 60 | 11:03:38.11+21.04 s | – | – |
| CLAClavier | 129.4 | 102 | 11:03:39.85+22.78 s | 11:03:55.27+38.20 s | 15.42 |
| RCHRochefort | 134.5 | 115 | 11:03:40.68+23.61 s | 11:03:56.73+39.66 s | 16.05 |