MELLES (BE)
Quarry blast15 March 2018
- Magnitude
- 1.3ML
- Depth
- 8.4km ± 5.0
- Belgian time
- 12:30:502018-03-15
- UTC
- 11:30:502018-03-15
Main parameters
| Date and time | 2018-03-15 11:30:50 UTC 2018-03-15 12:30:50 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.652° N, 3.466° E Uncertainty ± 5.2 km |
| Depth of hypocenter | 8.4 ± 5.0 km |
| Event ID | ROB 6400 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-03-16 10:26:26 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
- 9
- Epicentral distance
- 27.4 – 197.8km
- Mean velocity, P wave
- 6.0km/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 8.4 km. P wave: 6 measurements, root-mean-square deviation 0.25 s. S wave: 4 measurements, root-mean-square deviation 0.88 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 | 27.4 | 76 | 11:30:55.28+5.22 s | 11:30:59.23+9.17 s | 3.95 | – |
| SKQSteenkerque | 43.4 | 90 | 11:30:57.42+7.36 s | – | – | – |
| BRQBracquegnies | 51.2 | 112 | 11:30:58.59+8.53 s | – | – | – |
| RQRRonquières | 54.0 | 95 | 11:30:58.73+8.67 s | 11:31:04.47+14.41 s | 5.74 | – |
| DOUDourbes | 101.5 | 127 | 11:31:06.98+16.92 s | 11:31:20.10+30.04 s | 13.12 | 9.7 |
| GESGesves | 118.8 | 104 | 11:31:09.80+19.74 s | 11:31:24.96+34.90 s | 15.16 | – |
| CLAClavier | 132.7 | 101 | 11:31:11.97+21.91 s | 11:31:28.54+38.48 s | 16.57 | 2.5 |
| HOUHouvegnez | 183.2 | 99 | 11:31:19.66+29.60 s | 11:31:40.65+50.59 s | 20.99 | – |
| KLBKalborn | 197.8 | 107 | 11:31:19.84+29.78 s | – | – | – |