Location

2006/06/28 21:02:09 26.97 55.84 10

Moment Tensor Comparison

The following compares this source inversion to the USGS Rapid Moment Tensor Solution and to the Harvard CMT solutions, if they are available.

SLU	USGS	HARVARD CMT
Mw=5.7 2006/06/28 21:02:09 EVID: LAT: 26.97N, LON: 55.84E, DEPTH: 15 Mw: 5.7, mb: 0.0, Ms: 0.0 Mo= 0.431E+25 (dyne-cm) No. of Stations: 48, GAP: 101 Error (clvd/dc)*100= 54.04 Bandpass: 12 - 60 sec Nodal plane parameters strike dip rake NP1: 28 62 41 NP2: 276 55 145 --------------- --------------------# ------------------------### --------------------------##### ---------------------------###### ----------------------------####### -------##################---######### ----#########################--######## -###########################------##### ############################--------### ###########################-----------# ######### ##############------------- ######### T #############-------------- ######### ############--------------- ######################--------------- ####################--------------- #################---------------- ##############----------------- ##########----------- --- ####-------------- P --------------- Stat Dist Az Misfit Stat Dist Az Misfit AQU 37 305 0.39 ARU 29 3 0.46 BFO 42 313 0.55 BJT 51 59 0.70 BNI 42 308 0.65 BOSA 62 210 0.73 CART 48 297 0.57 COLA 86 9 0.75 CUC 35 301 0.56 DBIC 60 262 0.54 DIVS 33 310 0.91 DPC 38 318 0.41 DSB 52 317 0.64 ESK 50 320 0.79 GRFO 40 315 0.32 HGN 44 316 0.37 HIA 53 47 0.72 INCN 59 60 0.65 IPM 48 109 0.79 KEV 45 346 0.59 KHC 39 315 0.77 KIEV 31 326 0.63 KONO 45 328 0.55 KTH 87 11 0.59 KURK 29 30 0.70 KWP 34 320 0.82 LDM 63 98 0.68 LSA 31 76 0.78 LSZ 49 215 1.09 MA2 69 32 0.63 MAJO 68 58 0.60 MBAR 36 225 1.26 MDJ 60 52 0.91 MORC 37 318 0.67 OBN 31 338 0.49 PPLA 87 12 0.49 PSZ 34 316 0.74 RGN 41 323 0.33 RTC 53 293 0.54 SUMG 65 340 0.53 SUW 36 327 0.56 TIP 34 300 0.95 TLY 43 42 0.67 TSUM 59 223 0.72 ULN 44 48 0.84 VLC 40 307 0.65 VTS 30 308 0.51 WLF 44 314 0.20 Misfit > 1 heavily downweighted	06/06/28 21:02:16.18 SOUTHERN IRAN Epicenter: 26.999 55.795 MW 5.7 USGS MOMENT TENSOR SOLUTION Depth 5 No. of sta: 32 Moment Tensor; Scale 10**17 Nm Mrr= 4.77 Mtt=-0.93 Mpp=-3.84 Mrt= 0.74 Mrp= 2.10 Mtp=-1.94 Principal axes: T Val= 5.27 Plg=77 Azm=283 N 0.02 3 25 P -5.29 12 116 Best Double Couple:Mo=5.3*10**17 NP1:Strike=210 Dip=33 Slip= 95 NP2: 24 57 87 ------- -------------#### ---------#########--- --------############----- --------###############------ -------################-------- ------#################-------- ------##################--------- ------####### ########--------- -----######## T #######---------- -----######## ######----------- -----#################------ -- ----################------- P - ----##############--------- - ---#############------------- --##########------------- -#######------------- ###-------------- -------	June 28, 2006, SOUTHERN IRAN, MW=5.8 Goran Ekstrom CENTROID, MOMENT TENSOR SOLUTION HARVARD EVENT-FILE NAME C062806A DATA USED: GSN L.P. BODY WAVES: 71S,141C, T= 40 SURFACE WAVES: 79S,177C, T= 50 CENTROID LOCATION: ORIGIN TIME 21:02:13.5 0.1 LAT 26.80N 0.01;LON 55.82E 0.01 DEP 12.0 FIX;HALF-DURATION 2.0 MOMENT TENSOR; SCALE 10**24 D-CM MRR= 5.13 0.06; MTT=-4.41 0.06 MPP=-0.73 0.06; MRT= 2.54 0.16 MRP= 2.11 0.16; MTP=-3.12 0.05 PRINCIPAL AXES: 1.(T) VAL= 6.06;PLG=74;AZM=307 2.(N) 1.00; 6; 58 3.(P) -7.06; 15; 149 BEST DOUBLE COUPLE:M0=6.6*10**24 NP1:STRIKE=248;DIP=30;SLIP= 102 NP2:STRIKE= 54;DIP=60;SLIP= 83 ----------- ------------------- -----------######------ --------################--- ------####################### -----#######################--- ---######## #############---- ---######### T ############------ --########## ###########------- --#######################-------- -######################---------- ###################------------ #################-------------- ############----------------- ------------------- ----- ----------------- P --- --------------- - -----------

Deviatoric Moment Tensor Solution

The following broadband stations were used for the source inversion: AQU ARU BFO BJT BNI BOSA CART COLA CUC DBIC DIVS DPC DSB ESK GRFO HGN HIA INCN IPM KEV KHC KIEV KONO KTH KURK KWP LDM LSA LSZ MA2 MAJO MBAR MDJ MORC OBN PPLA PSZ RGN RTC SUMG SUW TIP TLY TSUM ULN VLC VTS WLF

Location of the earthquake (yellow star) and great circle path from the epicenter to each station (red) [created using GMT (Wessel, P., and W. H. F. Smith, New version of Generic Mapping Tools released, EOS Trans. AGU, 76 329, 1995.)]

All observed and Greens function waveforms are corrected to instrument response to ground velocity in meters/sec for the passband of 0.01 - 5 Hz. Next tre traces were bandpass filtered by the application of the following high- and low-pass stages:

hp c 0.0167 2
lp c 0.0833 2
int

The source inversion is a multipass operation since a lower frequency filter band is used for larger earthquakes and since a search is made over depth. Up to three passed of the outer loop are made, after which the moment magnitude is determined and filter settings readjusted. The inner loop over depth samples all depths from 0 to 800 km with 5 km increments in depth to 50 km, followed by 10 km depth sampling for the remaining range.

The following filter ranges are used according to the moment magnitude Mw:

   FILTER_BAND   FH(s)  FL(s)
       1           60     12      Mw < 6.4
       2          100     20      6.4 < Mw <= 6.9
       3          120     40      Mw > 6.9

For this data set the favored solution is

WVFMTD96   15.0   28.   62.   41.   5.72     0.306 0.255E-06     0.333     0.554 0.218E-06  54.0

The following figures show the sensitivity of the goodness of fit parameter so source depth, the waveform comparison as a function of epicentral distance in degrees and the source to station azimuth

Depth Sensitivity

Goodness of fit as a function of source depth. The measure is 1 - SUM (o -p)2 / SUM o2. A value of 1.0 is the best fit. The best double couple mechanism for the solution depth is plotted above goodness of fit value to indicate how the mefhanism may change with depth.

Fit with Distance

Fit with Azimuth

Comparison of the observed traces (red) and solution predicted traces (blue) as a function of source to station azimuth in degrees (D). The purpose of this display is to highlight the azimuthal dependence on the first motion. The traces are annotated with the station name at the top.

Detail wavefroms comparison

Comparison of observed (red) and predicted waveforms in order of increasing distance. For each station, the same plotting scale is used so that amplitudes can be compared. The maximum value of the bandpassfiltered ground velocity is indicated in units of meters/sec. The station name, epicentral distance in degrees and source-to-station azimuth are given. The time shift indicates the number of seconds that the predicted trace was shifted to match the observed.

Inversion Details