FRASNES-LEZ-ANVAING (BE)
Quarry blast17 September 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:00:112020-09-17
- UTC
- 11:00:112020-09-17
Main parameters
| Date and time | 2020-09-17 11:00:11 UTC 2020-09-17 13:00:11 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.643° N, 3.554° E Uncertainty ± 28.8 km |
| Event ID | ROB 10895 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-09-17 13:22:55 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
- 9
- Epicentral distance
- 37.2 – 173.8km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.2km/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 0.36 s. S wave: 4 measurements, root-mean-square deviation 0.89 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)9 stations | |||||
| SKQSteenkerque | 37.2 | 89 | 11:00:17.82+6.66 s | 11:00:24.56+13.40 s | 6.74 |
| BOUBougnies | 39.6 | 135 | 11:00:17.65+6.49 s | – | – |
| BRQBracquegnies | 45.0 | 113 | 11:00:19.04+7.88 s | – | – |
| RQRRonquières | 47.7 | 95 | 11:00:19.31+8.15 s | – | – |
| MRDMaredsous | 94.1 | 113 | 11:00:27.38+16.22 s | 11:00:42.55+31.39 s | 15.17 |
| DOUDourbes | 95.9 | 129 | 11:00:28.11+16.95 s | 11:00:41.02+29.86 s | 12.91 |
| GESGesves | 112.4 | 104 | 11:00:30.07+18.91 s | 11:00:47.41+36.25 s | 17.34 |
| RCHRochefort | 130.7 | 114 | 11:00:34.19+23.03 s | 11:00:50.84+39.68 s | 16.65 |
| MEMHMembach | 173.8 | 90 | 11:00:39.63+28.47 s | 11:01:01.61+50.45 s | 21.98 |