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

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: 

Parameter	Value	Uncertainty
Magnitude	4.7 mb	± 0.1
Location	38.524°N 29.162°W	± 3.8 km
Depth	10.0 km	± 1.9
Number of Phase Applied1	78
Minimum Distance2	82.71 km (0.74°)
Travel Time Residual3	0.60 sec
Azimuthal Gap4	91°

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)