FRASNES-LEZ-ANVAING (BE)
Quarry blast8 March 2019
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:03:002019-03-08
- UTC
- 12:03:002019-03-08
Main parameters
| Date and time | 2019-03-08 12:03:00 UTC 2019-03-08 13:03:00 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.675° N, 3.534° E Uncertainty ± 1.1 km |
| Event ID | ROB 7940 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-03-08 13:14:36 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
- 22.2 – 133.5km
- Mean velocity, P wave
- 6.1km/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: 8 measurements, root-mean-square deviation 0.20 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 | |||||
| LESLessines | 22.2 | 80 | 12:03:04.49+4.10 s | – | – |
| SKQSteenkerque | 38.7 | 94 | 12:03:07.61+7.22 s | 12:03:12.07+11.68 s | 4.46 |
| BRQBracquegnies | 47.8 | 117 | 12:03:08.84+8.45 s | – | – |
| RQRRonquières | 49.5 | 99 | 12:03:09.06+8.67 s | – | – |
| UCCBUccle | 59.9 | 77 | 12:03:11.34+10.95 s | 12:03:18.43+18.04 s | 7.09 |
| OSTBOostende | 75.3 | 327 | 12:03:13.29+12.90 s | 12:03:22.77+22.38 s | 9.48 |
| MRDMaredsous | 96.9 | 115 | 12:03:17.01+16.62 s | – | – |
| GESGesves | 114.8 | 106 | 12:03:19.83+19.44 s | – | – |
| RCHRochefort | 133.5 | 115 | 12:03:23.05+22.66 s | – | – |