Thursday, April 30, 2015

Magnitude 4.7 Earthquake of Ribeira Grande, Portugal 2015-04-30

2015-04-30 06:29:56 (UTC) :West of Ribeira Grande, Portugal

earthquake monitor, Portugal earthquake, earthquake realtime

Magnitude : 4.7

Event Time: Time and Date Starting of Earthquake Rupture 
  • 2015-04-30 06:29:56 (UTC)
Earthquake data:

Location : Position of Epicenter 

38.524°N 29.162°W

Depth : Depth of starting Rupture 

10.0 km

Region : Ribeira Grande, Portugal
Magnitude 4.7 Earthquake of Ribeira Grande, Portugal 2015-04-30

Directions and Distances :Directions and Distances from Geographical Reference in Close Proximity Which can be effected by Location Uncertainty

a) 40km (25mi) W of Ribeira Grande, Portugal

b) 170km (106mi) W of Angra do Heroismo, Portugal

c) 318km (198mi) WNW of Ponta Delgada, Portugal

d) 1282km (797mi) NW of Camara de Lobos, Portugal

e) 1740km (1081mi) W of Lisbon, Portugal

Location Uncertainty: 
4.7 mb
± 0.1
38.524°N 29.162°W
± 3.8 km
10.0 km
± 1.9
Number of Phase Applied1

Minimum Distance2
82.71 km (0.74°)

Travel Time Residual3
0.60 sec

Azimuthal Gap4

1Number of phase Applied: 
In determining location of hypocenter, applied number of observations on P waves and S waves. The greater the more accurate prediction of EQ.

2Minimum Distance:
 Horizontal distance of nearest Station measured in Km from epicenter. The smaller the more accuracy in prediction of depth of EQ.

3Travel Time Residual:
 A way of measurement of fit of arrival time observed to arrival time predicted for particular location. The smaller the better fit of data.

4Azimuthal Gap: 
Expressed in degree; the smaller the smaller the error in horizontal positioning of EQ. Large uncertainty is considered when exceeds 180° (both depth and location)

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