Location

2006/08/24 21:50:39 51.19 157.52 70

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=6.3 2006/08/24 21:50:39 EVID: LAT: 51.19N, LON: 157.52E, DEPTH: 35 Mw: 6.3, mb: 0.0, Ms: 0.0 Mo= 0.336E+26 (dyne-cm) No. of Stations: 78, GAP: 121 Error (clvd/dc)*100= 7.93 Bandpass: 12 - 60 sec Nodal plane parameters strike dip rake NP1: 50 62 107 NP2: 197 32 61 ---------###### --------############# --------################### --------####################### -------#########################- -------#########################--- -------######### #############----- -------########## T #############------ -------########## ############------- ------########################--------- ------#######################---------- ------#####################------------ ------####################------------- ------##################--------------- -----###############----------------- -----###########------------- --- ----#######----------------- P -- ####----------------------- - ###------------------------ ##------------------- #-------------- Stat Dist Az Misfit Stat Dist Az Misfit AAK 54 295 0.24 ACSO 74 43 0.48 AHID 59 59 0.26 ANTO 77 319 0.20 AQU 81 333 0.20 ARU 53 317 0.27 BBSR 88 34 0.46 BINY 75 37 0.29 BJT 30 264 0.57 BLA 78 43 99.66 BMN 57 64 0.24 BMO 54 60 0.33 BNI 80 339 0.25 BOZ 56 56 0.20 BR13 77 318 0.28 BRVK 50 308 0.99 BW06 59 58 0.25 CART 89 343 0.22 CBN 78 41 0.34 CM31 56 257 0.30 CMB 56 68 0.25 CSS 81 316 0.25 CTAO 71 191 1.14 DIV 32 49 0.58 DSB 75 350 0.15 DUG 59 62 0.25 EGMT 56 53 0.30 ELK 58 63 0.23 ERPA 74 40 0.27 ESK 72 348 0.20 EYMN 64 43 0.14 FCC 55 36 0.19 GNI 71 311 0.22 HAWA 52 60 ***** HLID 56 60 0.33 HOPS 54 69 0.27 HRV 77 34 0.13 HWUT 59 60 0.35 INK 36 35 0.26 ISCO 64 58 0.39 ISP 79 320 0.15 JCT 74 61 0.20 KBS 48 351 3.94 KIV 69 315 0.25 KONO 66 342 0.63 LOHW 58 58 0.44 MALT 76 314 0.24 MOOW 58 58 0.54 MORC 73 334 0.21 MTE 87 348 0.16 NAO0 65 342 0.23 OBN 63 326 0.28 PAL 77 37 0.20 PALK 76 264 0.26 PFO 62 70 0.31 PSZ 74 331 0.16 RES 45 20 0.90 RGN 70 338 0.13 RRI2 58 58 0.44 RUE 72 337 0.18 SCHQ 68 25 0.25 SNOW 58 58 0.44 STU 76 339 0.14 SUMG 56 5 0.22 SUW 68 333 0.15 TLY 32 292 0.51 TPAW 58 58 0.45 TPH 58 66 0.26 TUC 66 67 0.20 ULM 61 44 0.25 ULN 32 284 0.65 VLC 80 336 0.26 VSL 85 335 0.18 WALA 53 54 0.27 WLF 76 341 0.15 WRAB 73 202 0.85 YBH 53 66 0.58 ZRNK 51 308 0.42 Misfit > 1 heavily downweighted	06/08/24 21:50:39.80 NEAR EAST COAST OF KAMCHATKA Epicenter: 51.188 157.523 MW 6.5 USGS MOMENT TENSOR SOLUTION Depth 36 No. of sta: 87 Moment Tensor; Scale 10**18 Nm Mrr= 5.39 Mtt=-1.83 Mpp=-3.56 Mrt= 0.98 Mrp= 1.91 Mtp=-3.16 Principal axes: T Val= 5.79 Plg=79 Azm=286 N 0.56 4 36 P -6.35 10 127 Best Double Couple:Mo=6.1*10**18 NP1:Strike=222 Dip=35 Slip= 97 NP2: 33 55 85 ------- ----------------- -------------#######- ----------############--- ---------###############----- --------#################------ -------##################------ ------###################-------- -----######## #########-------- -----######## T ########--------- ----######### #######---------- ----##################----------- ---#################----------- ---###############-------- -- --#############---------- P - -##########------------ #####---------------- ----------------- -------	August 24, 2006, NEAR EAST COAST OF KAMCHATKA, MW=6.5 Goran Ekstrom CENTROID, MOMENT TENSOR SOLUTION HARVARD EVENT-FILE NAME C082406A DATA USED: GSN L.P. BODY WAVES: 67S,176C, T= 40 MANTLE WAVES: 62S,139C, T=125 CENTROID LOCATION: ORIGIN TIME 21:50:42.3 0.1 LAT 50.92N 0.01;LON 158.07E 0.01 DEP 51.3 0.4;HALF-DURATION 4.1 MOMENT TENSOR; SCALE 10**25 D-CM MRR= 5.46 0.04; MTT=-1.49 0.04 MPP=-3.97 0.04; MRT= 1.18 0.06 MRP= 2.48 0.06; MTP=-2.41 0.03 PRINCIPAL AXES: 1.(T) VAL= 6.12;PLG=76;AZM=290 2.(N) -0.03; 2; 30 3.(P) -6.09; 13; 121 BEST DOUBLE COUPLE:M0=6.1*10**25 NP1:STRIKE=214;DIP=32;SLIP= 95 NP2:STRIKE= 29;DIP=58;SLIP= 87 ----------- ----------######### --------############--- -------###############----- -------################------ ------##################------- -----###################------- -----####### #########--------- -----####### T #########--------- ----######## ########---------- ----##################----------- ---#################----------- ---################------- -- --##############--------- P - --############---------- -########-------------- ####--------------- -----------

Deviatoric Moment Tensor Solution

The following broadband stations were used for the source inversion: AAK ACSO AHID ANTO AQU ARU BBSR BINY BJT BLA BMN BMO BNI BOZ BR131 BRVK BW06 CART CBN CM31 CMB CSS CTAO DIV DSB DUG EGMT ELK ERPA ESK EYMN FCC GNI HAWA HLID HOPS HRV HWUT INK ISCO ISP JCT KBS KIV KONO LOHW MALT MOOW MORC MTE NAO01 OBN PAL PALK PFO PSZ RES RGN RRI2 RUE SCHQ SNOW STU SUMG SUW TLY TPAW TPH TUC ULM ULN VLC VSL WALA WLF WRAB YBH ZRNK

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   35.0   50.   62.  107.   6.32     0.580 0.964E-06     0.610     0.763 0.899E-06   7.9

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.

Detailed Waveform Comparison

Comparison of the observed traces (red) and solution predicted traces (blue) ordered in terms of increasing epicentral distance. Each pair of traces is annotated with the station name, epicentral distance in degrees, source to station azimuth in degrees. Each pair of traces is plotted with the same scale and the peak amplitudes are indicated at the lect of each trace. Finally the time shift between the P-wave first arrival picked and the the theoretical P-wave first arrival in the predicted trace is indicated, with a positive sign indicating that the predicted trace has been shifted to the right by the given number of seconds. 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.

Inversion Details