LESSINES (BE)
Quarry blast2 April 2019
- Magnitude
- 2.0ML
- Depth
- 1.6km ± 3.9
- Belgian time
- 12:42:132019-04-02
- UTC
- 10:42:132019-04-02
Main parameters
| Date and time | 2019-04-02 10:42:13 UTC 2019-04-02 12:42:13 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.736° N, 3.845° E Uncertainty ± 4.2 km |
| Depth of hypocenter | 1.6 ± 3.9 km |
| Event ID | ROB 8015 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-04-02 13:05:05 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
- 2.7 – 158.9km
- Mean velocity, P wave
- 5.7km/s
- Mean velocity, S wave
- 3.4km/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. Hypocenter at a depth of 1.6 km. P wave: 7 measurements, root-mean-square deviation 0.43 s. S wave: 5 measurements, root-mean-square deviation 0.33 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 | nm | |
|---|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)9 stations | ||||||
| LESLessines | 2.7 | 182 | 10:42:14.15+0.59 s | 10:42:14.36+0.80 s | 0.21 | – |
| SKQSteenkerque | 19.2 | 120 | 10:42:16.80+3.24 s | 10:42:18.84+5.28 s | 2.04 | 139.0 |
| RQRRonquières | 30.5 | 118 | 10:42:18.58+5.02 s | – | – | – |
| BRQBracquegnies | 35.1 | 144 | 10:42:19.79+6.23 s | – | – | – |
| DOUDourbes | 89.0 | 143 | 10:42:29.27+15.71 s | 10:42:39.91+26.35 s | 10.64 | – |
| GESGesves | 96.3 | 113 | 10:42:30.84+17.28 s | 10:42:41.54+27.98 s | 10.70 | – |
| CLAClavier | 109.1 | 108 | 10:42:31.62+18.06 s | 10:42:46.28+32.72 s | 14.66 | – |
| MEMHMembach | 153.7 | 94 | 10:42:39.36+25.80 s | 10:42:55.85+42.29 s | 16.49 | – |
| HOUHouvegnez | 158.9 | 105 | 10:42:39.25+25.69 s | 10:42:56.30+42.74 s | 17.05 | – |