NAAST (BE)
Quarry blast2 May 2018
- Magnitude
- 1.1ML
- Depth
- 4.7km ± 4.8
- Belgian time
- 12:08:372018-05-02
- UTC
- 10:08:372018-05-02
Main parameters
| Date and time | 2018-05-02 10:08:37 UTC 2018-05-02 12:08:37 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.569° N, 4.120° E Uncertainty ± 2.0 km |
| Depth of hypocenter | 4.7 ± 4.8 km |
| Event ID | ROB 6550 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-05-02 14:23:37 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
- 5
- Epicentral distance
- 8.5 – 62.6km
- 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 4.7 km. P wave: 5 measurements, root-mean-square deviation 0.25 s. S wave: 4 measurements, root-mean-square deviation 0.23 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 | nm | |
|---|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)5 stations | ||||||
| RQRRonquières | 8.5 | 61 | 10:08:39.13+1.70 s | 10:08:40.32+2.89 s | 1.19 | – |
| SKQSteenkerque | 9.3 | 343 | 10:08:39.40+1.97 s | 10:08:40.76+3.33 s | 1.36 | 27.5 |
| BRQBracquegnies | 9.8 | 173 | 10:08:39.20+1.77 s | – | – | – |
| LESLessines | 25.2 | 309 | 10:08:41.49+4.06 s | 10:08:45.33+7.90 s | 3.84 | – |
| DOUDourbes | 62.6 | 147 | 10:08:48.67+11.24 s | 10:08:55.70+18.27 s | 7.03 | – |
Did you feel an earthquake?The inquiry takes just a few minutes. Every report helps seismologists assess the effects of the earthquake.
Take the inquiry