Strong Earthquake Tonga Islands 01-Aug-13 (b000itmf)

See source attribution and disclaimer notice

Preliminary Details

Derived from Event Data Source: USGS, GFZ Potsdam and EMSC. See location map below

  • Date-Time: Thursday, August 01, 2013 @ 20:01:41 UTC
  • Earthquake location: 15.282°S, 173.444°W
  • Earthquake depth: 17.0 km
  • Distances:
    1. 80km (49mi) NNE of Hihifo, Tonga
    2. 241km (149mi) SW of Apia, Samoa
    3. 311km (193mi) WSW of Tafuna, American Samoa
    4. 315km (195mi) WSW of Pago Pago, American Samoa
    5. 673km (418mi) NNE of Nuku`alofa, Tonga
  • Event ID: usb000itmf

gfz2013oywh
(Click this image for the GFZ Potsdam site)

USGS are promulgating a Mag 5.8 Mwb (Mw determined from the body wave) however EMSC and GFZ Potsdam both have it over Mag 6.

USGS Body-Wave Moment Tensor Solution

13/08/01 20:01:41.49

Epicenter: -15.282 -173.444
MW 5.8

USGS MOMENT TENSOR SOLUTION
Depth  35         No. of sta: 65
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.24       Mtt=-1.31
  Mpp= 1.07       Mrt=-5.72
  Mrp= 2.80       Mtp=-1.19
 Principal axes:
  T  Val=  6.73  Plg=44  Azm=219
  N       -0.29      15      115
  P       -6.43      43       11

Best Double Couple:Mo=6.6*10**17
 NP1:Strike=295 Dip=89 Slip= 105
 NP2:        27     15         2

b000itmf_mt_smt

GFZ Potsdam Tensor Solution

GFZ Event gfz2013oywh
13/08/01 20:01:44.44
Tonga Islands
Epicenter: -15.21 -173.55
MW 6.1

GFZ MOMENT TENSOR SOLUTION
Depth  41         No. of sta: 40
Moment Tensor;   Scale 10**18 Nm
  Mrr=-0.57       Mtt= 0.39
  Mpp= 0.19       Mrt=-1.29
  Mrp= 0.60       Mtp=-0.25
Principal axes:
  T  Val=  1.51  Plg=34  Azm=208
  N        0.03       3      116
  P       -1.54      56       22

Best Double Couple:Mo=1.5*10**18
 NP1:Strike=116 Dip=79 Slip= -92
 NP2:       311     11       -74

           ###########           
        #------------####        
     #------------------####     
    ----------------------###    
  ----------------   -------###  
  ---------------- P --------##  
 ###--------------   ---------## 
######-------------------------##
#########----------------------##
############--------------------#
###############-----------------#
###################-------------#
 #######################-------# 
  ############################-  
  #######   ##################-  
    ##### T #################    
     ####   ################     
        #################        
           ###########           

About PuterMan

A retired programmer.
This entry was posted in 12 - Kermadec - Tonga - Samoa Basin Area, 1730 - Tonga Islands, Earthquakes 2013, Magnitude 5 and tagged , , . Bookmark the permalink.