TOURNAI (BE)
Quarry blast30 April 2019
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 13:01:052019-04-30
- UTC
- 11:01:052019-04-30
Main parameters
| Date and time | 2019-04-30 11:01:05 UTC 2019-04-30 13:01:05 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.623° N, 3.386° E Uncertainty ± 7.5 km |
| Event ID | ROB 8095 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-04-30 13:16:26 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
- 7
- Epicentral distance
- 47.4 – 123.5km
- Mean velocity, P wave
- 5.3km/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: 6 measurements, root-mean-square deviation 0.71 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)7 stations | |||||
| BOUBougnies | 47.4 | 123 | 11:01:13.36+8.21 s | 11:01:18.28+13.13 s | 4.92 |
| SKQSteenkerque | 49.2 | 86 | 11:01:12.92+7.77 s | 11:01:19.14+13.99 s | 6.22 |
| BRQBracquegnies | 55.4 | 106 | 11:01:13.99+8.84 s | – | – |
| RQRRonquières | 59.4 | 91 | 11:01:15.22+10.07 s | – | – |
| DOUDourbes | 104.1 | 124 | 11:01:22.46+17.31 s | 11:01:35.51+30.36 s | 13.05 |
| MRDMaredsous | 104.4 | 109 | 11:01:24.75+19.60 s | – | – |
| GESGesves | 123.5 | 102 | 11:01:27.06+21.91 s | 11:01:41.07+35.92 s | 14.01 |