TOURNAI (BE)
Quarry blast5 July 2023
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 13:00:212023-07-05
- UTC
- 11:00:212023-07-05
Main parameters
| Date and time | 2023-07-05 11:00:21 UTC 2023-07-05 13:00:21 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.657° N, 3.444° E Uncertainty ± 33.0 km |
| Event ID | ROB 19855 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-07-10 12:17:06 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
- 4
- Epicentral distance
- 45.0 – 103.0km
- Mean velocity, P wave
- 5.7km/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: 4 measurements, root-mean-square deviation 0.11 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)4 stations | |||||
| SKQSteenkerque | 45.0 | 91 | 11:00:29.48+7.72 s | 11:00:35.97+14.21 s | 6.49 |
| BRQBracquegnies | 52.8 | 111 | 11:00:30.78+9.02 s | – | – |
| RQRRonquières | 55.6 | 96 | 11:00:31.56+9.80 s | 11:00:38.24+16.48 s | 6.68 |
| DOUDourbes | 103.0 | 127 | 11:00:39.63+17.87 s | 11:00:52.17+30.41 s | 12.54 |
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