Location

2006/04/20 23:25:05 61.09 167.10 43

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=7.3 2006/04/20 23:25:05 EVID: LAT: 61.09N, LON: 167.10E, DEPTH: 80 Mw: 7.3, mb: 0.0, Ms: 0.0 Mo= 0.107E+28 (dyne-cm) No. of Stations: 205, GAP: 45 Error (clvd/dc)*100= 58.82 Bandpass: 40 - 100 sec Nodal plane parameters strike dip rake NP1: 41 46 91 NP2: 219 44 89 --------------- --------------------- ----------------########### --------------###############-- ------------###################-- -----------#####################--- ----------#######################---- ----------#######################------ ---------########################------ --------########## ###########------- -------########### T ###########------- ------############ ##########-------- ------########################--------- ------######################----------- ----######################----------- ---####################------------ ---#################---------- --##############------------- P -########------------------ --------------------- --------------- Stat Dist Az Misfit Stat Dist Az Misfit 115A 57 80 0.46 116A 57 79 0.48 A05A 40 74 0.41 ACSO 64 53 1.78 AFI 76 158 0.60 AHID 50 71 0.71 ALLY 64 50 1.36 ANMO 58 74 0.53 ANTO 72 324 0.72 APE 77 329 0.94 ARU 50 316 0.47 B04A 40 76 0.37 BBSR 77 42 2.71 BFO 69 345 1.30 BINY 65 46 2.51 BJT 37 259 0.37 BLA 67 52 1.69 BMN 48 78 0.70 BRNJ 66 46 1.52 BTDF 76 246 2.71 C03A 39 77 0.42 C04A 40 76 0.49 C05A 41 75 0.50 CART 81 350 0.89 CCM 62 60 0.26 CDVI 91 48 0.99 CMB 49 83 0.60 COCO 91 247 2.65 COR 42 79 0.33 CPNY 67 46 2.62 CRPR 90 50 0.98 CRY 54 83 0.35 CSS 77 322 0.62 CTAO 82 199 1.77 CVS 48 84 0.56 D03A 40 77 0.49 D04A 41 76 0.48 D05A 41 76 0.49 DGMT 48 62 1.40 DPC 66 339 1.18 DUG 51 75 0.57 DWPF 75 58 1.38 E04A 41 77 0.44 E05A 42 76 0.43 EIDS 87 194 9.97 ELK 49 76 0.56 ENH 48 257 0.85 ERPA 63 49 2.17 ESK 63 353 1.58 EUO 43 80 0.29 EYMN 54 54 1.29 F03A 41 78 0.39 F04A 42 77 0.41 F05A 42 76 0.38 FARB 48 85 0.50 FFC 44 55 0.92 FITZ 85 219 1.80 GNI 68 316 0.58 GRFO 67 343 1.41 GVD 79 329 0.76 H02A 42 80 0.34 H05A 43 77 0.38 HATC 46 81 0.67 HAWA 43 75 0.40 HGN 67 347 1.52 HKT 67 68 1.10 HLG 63 346 1.01 HNR 70 187 1.59 HRV 66 43 3.88 HUMO 44 81 0.39 HWUT 50 73 0.59 I02A 43 80 0.31 I05A 44 78 0.39 I06A 44 77 0.46 INCN 34 245 0.44 ISCO 54 70 0.51 ISP 75 325 0.67 JTS 89 69 0.73 K01A 43 82 0.33 KBS 39 352 1.16 KCC 50 82 0.77 KEV 46 342 0.55 KHC 68 341 0.62 KIP 46 132 0.62 KIV 66 319 0.71 KKM 66 237 2.22 KONO 58 346 0.94 KSDI 78 320 0.50 KSM 73 240 2.23 KSU1 59 63 1.33 KUM 74 251 1.60 KWP 65 335 0.79 LAST 79 328 0.73 LRAL 68 60 1.04 M02C 45 82 0.47 M03C 45 81 0.54 M04C 45 81 0.57 M06C 46 80 0.61 M07A 47 79 0.63 MAHO 78 346 1.54 MALT 72 319 0.61 MAUI 47 130 0.44 MBWA 90 223 3.26 MCWV 65 51 1.78 MEGW 41 78 0.58 MELI 83 351 2.06 MIDW 34 155 0.65 MNTX 61 75 0.67 MONP 55 83 0.35 MORC 66 339 1.00 MPR 89 50 0.88 MSO 45 70 1.66 MTE 78 355 1.93 N02C 45 83 1.49 NATX 66 66 1.13 NCB 64 44 2.78 O03C 47 82 0.59 O04C 47 81 0.60 O06A 47 80 0.60 O08A 48 79 0.68 OBN 57 328 0.41 OCWA 40 77 0.40 OFR 39 77 0.58 ORV 47 82 0.61 P08A 49 79 0.67 PALK 81 270 1.22 PFO 54 83 0.36 PIN 44 78 0.97 PKD 50 84 0.43 PMG 72 200 2.29 PSZ 68 336 0.91 Q04C 48 83 0.58 Q09A 50 79 0.56 QIZ 57 249 0.92 R04C 48 83 0.53 R06C 49 81 0.55 R07C 49 81 0.50 RGN 62 343 0.87 RRX 53 82 0.35 RSSD 52 65 0.71 RUE 64 342 0.99 S06C 49 82 0.50 S09A 51 80 0.48 SANT 77 329 0.61 SAO 49 85 1.22 SBC 52 85 0.33 SDCO 56 71 0.39 SDMD 67 49 4.56 SDP 52 85 0.40 SENI 71 345 0.99 SFJD 49 18 4.04 SFS 82 354 1.56 SHO 53 81 0.38 SLA 52 82 0.34 SMER 54 83 0.36 SMM 51 84 0.38 SNCC 53 86 0.34 STKA 94 201 2.11 STU 69 344 1.24 STVI 90 48 0.98 SUMG 45 10 2.14 SUTB 47 83 0.63 SUW 61 336 0.60 SVD 54 83 0.32 TAKO 43 81 0.45 TATO 47 241 1.71 TEIG 79 67 1.03 TIRR 69 329 0.75 TLY 35 283 0.41 TOLO 42 80 0.35 TOV 53 84 0.36 TPNV 52 80 0.45 TUC 58 79 0.75 U05C 50 84 0.44 ULN 35 276 0.35 V03C 50 85 0.41 V04C 51 85 0.43 V05C 51 84 0.46 VCS 53 83 0.37 VES 51 83 0.39 VOS 48 306 0.51 VSU 56 336 0.56 VTV 53 83 0.33 W12A 54 80 0.38 W14A 55 79 0.38 W15A 55 78 0.42 WCI 64 56 3.35 WDC 46 82 0.46 WIFE 44 79 0.39 WLF 68 346 1.20 WRAB 84 210 1.79 WUAZ 55 77 0.42 WVOR 46 78 0.71 WVT 65 59 1.71 X13A 55 80 0.39 X14A 55 79 0.41 X15A 56 79 0.40 Y12C 55 81 0.40 Y13A 55 80 0.40 Y14A 56 80 0.41 Y22C 58 75 0.58 YAQ 55 83 0.34 YBH 45 81 0.45 Z14A 56 80 0.45 ZKR 78 328 0.67 Misfit > 1 heavily downweighted	Mw=7.4 KORYAKIA, RUSSIA 2006/04/20 23:25: 5.40 EVID: LTBT LAT: 61.09N, LON: 167.10E, DEPTH: 60 Mw: 7.4, mb: 7.7, Ms: 7.7 Mo= 0.146E+28 (dyne-cm) No. of Stations: 22, GAP: 87 Error (clvd/dc)*100= 44.20 Nodal plane parameters strike dip rake NP1: 66 53 111 NP2: 214 42 65 ---------- -------------------- --------------############ -------------################# -----------##################### ----------######################## ----------########################## ---------############################- --------############################-- --------############################---- --------###########################----- -------###########################------ -------#########################-------- -----########################--------- -----#####################------------ ----##################-------------- ###############------------------- ###----------------------------- ##---------------------------- #------------------------- -------------------- ---------- Stat Dist Az Misfit Stat Dist Az Misfit AAK 54 295 0.17 AFI 76 158 0.33 ANMO 58 74 0.52 ARU 50 316 0.56 BORG 54 4 1.39 BW06 50 70 0.74 CMB 49 83 0.52 COR 42 79 0.32 FCC 44 46 0.66 FFC 44 55 0.74 HKT 67 68 1.56 INCN 34 245 0.50 KEV 46 342 1.18 KONO 58 346 0.60 MOD 46 79 0.34 MSO 45 70 1.13 OBN 57 328 0.63 SIT 29 71 0.75 TLY 35 283 0.34 TUC 58 79 0.67 ULN 35 276 0.32 WDC 46 82 0.32 Median of misfit: 0.58 Average misfit: 0.65	April 20, 2006, KORYAKIA, RUSSIA, MW=7.6 Goran Ekstrom CENTROID, MOMENT TENSOR SOLUTION HARVARD EVENT-FILE NAME C042006A DATA USED: GSN L.P. BODY WAVES: 72S,189C, T= 50 MANTLE WAVES: 73S,185C, T=150 CENTROID LOCATION: ORIGIN TIME 23:25:18.4 0.1 LAT 60.91N 0.01;LON 166.98E 0.02 DEP 12.0 FIX;HALF-DURATION 15.3 MOMENT TENSOR; SCALE 10**27 D-CM MRR= 2.82 0.01; MTT=-0.86 0.01 MPP=-1.96 0.01; MRT= 0.67 0.14 MRP= 0.25 0.13; MTP=-1.63 0.01 PRINCIPAL AXES: 1.(T) VAL= 2.94;PLG=80;AZM= 2 2.(N) 0.25; 8; 217 3.(P) -3.19; 6; 126 BEST DOUBLE COUPLE:M0=3.1*10**27 NP1:STRIKE=207;DIP=40;SLIP= 77 NP2:STRIKE= 44;DIP=51;SLIP= 101 ----------- -----------######## ---------############## ---------################-- --------##################--- --------###################---- -------####### ##########---- -------######## T #########------ ------######### ########------- ------###################-------- ------##################--------- ----##################--------- -----###############----------- ----#############--------- ---##########------------ P --####----------------- #------------------ -----------

Deviatoric Moment Tensor Solution

The following broadband stations were used for the source inversion: 115A 116A A05A ACSO AFI AHID ALLY ANMO ANTO APE ARU B04A BBSR BFO BINY BJT BLA BMN BRNJ BTDF C03A C04A C05A CART CCM CDVI CMB COCO COR CPNY CRPR CRY CSS CTAO CVS D03A D04A D05A DGMT DPC DUG DWPF E04A E05A EIDS ELK ENH ERPA ESK EUO EYMN F03A F04A F05A FARB FFC FITZ GNI GRFO GVD H02A H05A HATC HAWA HGN HKT HLG HNR HRV HUMO HWUT I02A I05A I06A INCN ISCO ISP JTS K01A KBS KCC KEV KHC KIP KIV KKM KONO KSDI KSM KSU1 KUM KWP LAST LRAL M02C M03C M04C M06C M07A MAHO MALT MAUI MBWA MCWV MEGW MELI MIDW MNTX MONP MORC MPR MSO MTE N02C NATX NCB O03C O04C O06A O08A OBN OCWA OFR ORV P08A PALK PFO PIN PKD PMG PSZ Q04C Q09A QIZ R04C R06C R07C RGN RRX RSSD RUE S06C S09A SANT SAO SBC SDCO SDMD SDP SENIN SFJD SFS SHO SLA SMER SMM SNCC STKA STU STVI SUMG SUTB SUW SVD TAKO TATO TEIG TIRR TLY TOLO TOV TPNV TUC U05C ULN V03C V04C V05C VCS VES VOS VSU VTV W12A W14A W15A WCI WDC WIFE WLF WRAB WUAZ WVOR WVT X13A X14A X15A Y12C Y13A Y14A Y22C YAQ YBH Z14A ZKR

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 0.0083 2
lp c 0.0250 2

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   80.0   41.   46.   91.   7.32     0.021 0.780E-04     0.030     0.146 0.548E-04  58.8

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.

Inversion Details