Showing posts with label ALASKA earthquake. Show all posts
Showing posts with label ALASKA earthquake. Show all posts

Sunday, June 29, 2014

Magnitude 4.8 Earthquake of Little Sitkin Island, Alaska 2014-06-29

2014-06-29 08:54:45 UTC: Little Sitkin Island, Alaska EARTHQUAKE

Magnitude:4.8

Event Time: Time and Date Starting of Earthquake Rupture 

2014-06-29 08:54:45 UTC

2014-06-28 23:54:45 UTC-09:00 at epicenter
  1. 2014-06-29 14:54:45 UTC+06:00 system time


Earthquake data:

Location : Position of Epicenter 

51.759°N 178.490°E

Depth : Depth of starting Rupture 

90.4km (56.2mi)


Region : Little Sitkin Island, Alaska

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

a) 21km (13mi) S of Little Sitkin Island, Alaska

b) 1353km (841mi) E of Petropavlovsk-Kamchatskiy, Russia
c)1370km (851mi) E of Vilyuchinsk, Russia

d)1371km (852mi) E of Yelizovo, Russia

e)
2974km (1848mi) W of Whitehorse, Canada

Location Uncertainty: 
Parameter
Value
Uncertainty
Magnitude
4.8 mb
± 0.04
Location
51.759°N, 178.490°E
--
Depth
90.4 km
± 4.9 km
Number of Phase Applied1
88

Minimum Distance2
70.6 km (0.63°)

Travel Time Residual3
1.10 sec

Azimuthal Gap4
71°

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)

Saturday, December 24, 2011

Magnitude 3.6 Earthquake of CENTRAL ALASKA 2011 December 24

2011 December 24 01:55:54 UTC: CENTRAL ALASKA

Magnitude: 3.6

Date-Time : Saturday, December 24, 2011 at 01:55:54 UTC
Friday, December 23, 2011 at 04:55:54 PM at epicenter

Location :
62.218°N, 153.405°W

Depth :
1 km (~0.6 mile) set by location program

Region :
CENTRAL ALASKA

Distances:

a)
101 km (63 miles) SSE (150°) from Nikolai, AK

b) 118 km (73 miles) WNW (290°) from Skwentna, AK


c) 138 km (86 miles) SE (125°) from McGrath, AK


d) 223 km (139 miles) WNW (302°) from Anchorage, AK

Location Uncertainty: horizontal +/- 0.4 km (0.2 miles); depth fixed by location program

Parameters : NST= 30, Nph= 33, Dmin=97.9 km, Rmss=0.7 sec, Gp= 97°, M-type=local magnitude (ML), Version=2

Friday, December 9, 2011

Magnitude 4.4 Earthquake of CENTRAL ALASKA 2011 December 09

2011 December 09 01:25:41 UTC : CENTRAL ALASKA

Magnitude:
4.4


Date-Time :
Friday, December 09, 2011 at 01:25:41 UTC
Thursday, December 08, 2011 at 04:25:41 PM at epicenter

Location :
62.255°N, 145.693°W

Depth :
23.4 km (14.5 miles) set by location program

Region :
CENTRAL ALASKA


Distances: a) 14 km (9 miles) W (277°) from Gulkana, AK

b) 18 km (11 miles) NNW (337°) from Glennallen, AK


Location Uncertainty: horizontal +/- 0.3 km (0.2 miles); depth fixed by location program


Parameters : Nph= 43, Dmin=0 km, Rmss=1.02 sec, Gp= 0, M-type=local magnitude (ML), Version=2

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