T3-P64

Integration of Open Source Seismic Waveform Data in the IDC Processing:

Case Study for 2011 R.B. Raykova, A. Tuppurainen, J. Given (Comprehensive Nuclear-Test-Ban Treaty Organization, Vienna, Austria)

PROCESSING

DFX and StaPro. The OSD stations were configured as primary IMS stations. The necessary parameters in parameter files and database tables

were set to the default or most common values. All stations from the OSD database were processed by Detection and Feature Extraction (DFX) and

Station Processing (StaPro) applications on the CTBTO VDEC platform. The applications were run for one-day intervals during 2011 and the

obtained results are: 4090382 detected arrivals, 8106847 amplitude measurements, 372925 station associations, 13216 StaPro event associations and

3479 StaPro origins.

ABSTRACT. The effects of adding data from open source seismic stations in the waveform processing system at CTBTO/IDC were explored. About 50

stations, located in the whole world and providing open source waveform data, were selected by the following criteria: located in areas less covered by

IMS stations; provided continuous data and real-time access; broad-band instrumentation; recording data at least 70 % during 2011; included in various

networks. One-year waveform data from BH or HH continuous streams from 14 national or international networks were obtained from IRIS data centre in

SEED format. The data were converted to CSS format and a database account (OSD) containing site, sensor, and wfdisc information was created. Most of

the instruments are STS-2 and the sampling rate of the data varies from 20 to 100 sps. Additional database tables and parameter files, necessary for

processing OSD in the IDC pipeline, were created. The waveforms were processed by the IDC station processing applications DFX and StaPro, on the

CTBTO VDEC platform. Further, the detections from OSD and IDC stations and arrays were analysed together by the IDC Global Association network

processing software. The origin parameters and their uncertainties were compared to parameters in SEL3 evaluating the potential improvements.

OSD waveform archive data (2011)

IRIS data center, seed data format

14 seismic networks

56 three-component broad-band SS

instruments: STS1, STS2, CMG3E, CMG3T,

CMG40T, KS54000, KS2000, Trillium

21 stations with double BH location

(different instruments or sampling rate)

BH or HH channels

sampling rate: 20, 40, 50 or 100 sps

seed-to-db (css3.0) data conversion

OSD@VDEC database archive

OSD real-time waveform data

slinktool to rtserve.iris.washington.edu

47 OSD stations with unique BH/HH streams

near-real time miniseed-to-db conversion

20-days data buffer

real-time seisGram2K monitoring

OSD peculiarities

errors in the seed volumes

not-orthogonal station components

non-standard component orientation

change of the component names

varying sampling rate (timing problems)

6 stations repeated the IMS stations

NET STA CHANNELS LOC INSTYP SPS %2011 NET STA CHANNELS LOC INSTYP SPS %2011

AF GRM BHE BHN BHZ -- KS2000 20 69.31

II

ASCN BH1 BH2 BHZ 10 CMG-3T 40 99.94

AK

COLD BHE BHN BHZ -- CMG3T 50 93.14 COCO BH1 BH2 BHZ 10 STS-2 40 99.94

GAMB BHE BHN BHZ -- CMG3E3 50 95.80 DGAR BHE BHN BHZ 10 STS-2 40 100.0

RDOG BHE BHN BHZ -- Tril24 50 39.89 EFI BH1 BH2 BHZ 10 CMG-3T 40 96.61

AU

ARMA BHE BHN BHZ -- STS-2 40 91.02 HOPE BH1 BH2 BHZ 10 Tril24 40 80.34

EIDS BHE BHN BHZ -- STS-2 40 90.85 MSVF BH1 BH2 BHZ 00 KS5400 20 99.44

FORT BHE BHN BHZ -- CMG40T 40 50.97 PALK BH1 BH2 BHZ 10 CMG-3T 40 ~70.0

GIRL BHE BHN BHZ -- CMG3ES 40 91.26 SHEL BH1 BH2 BHZ 10 STS-2 40 71.51

MANU BHE BHN BHZ -- STS-2 40 78.13 TAU BH1 BH2 BHZ 10 STS-2 40 99.06

MCQ BHE BHN BHZ -- STS-2 40 91.06

IU

BILL BHE BHN BHZ 00 STS-1H 20 92.58

CU GTBY BH1 BH2 BHZ 00 STS-2 40 99.99 FUNA BH1 BH2 BHZ 10 Tril24 40 96.93

DK KULLO HHE HHN HHZ -- STS-2 100 99.97 FURI BHE BHN BHZ 00 STS-1H 20 97.40

G

CAN BHE BHN BHZ 00 STS-1 20 99.43 KBL BHE BHN BHZ -- STS-2 40 96.50

CLF BHE BHN BHZ 00 STS-2 20 98.79 KNTN

BH1 BH2 BHZ 00 STS-2 40 31.40

FDF BHE BHN BHZ 00 STS-2 20 99.97 BHE BHN BHZ 00 STS-2 40 24.03

SPB BHE BHN BHZ 00 STS-1 20 91.11 OTAV BH1 BH2 BHZ 10 STS-2 40 97.51

TAM BHE BHN BHZ 00 STS-1 20 99.88 PTCN BHE BHN BHZ 01 STS-2 40 97.70

TAOE BHE BHN BHZ 00 STS-2 50 ~80.0 PTGA BH1 BH2 BHZ 10 STS-2 40 100.0

GE

DAG BHE BHN BHZ -- STS-2 20 98.95 RCBR BH1 BH2 BHZ 10 STS-2 40 97.31

SUMG BHE BHN BHZ -- STS-2 20 99.75 SAML BH1 BH2 BHZ 10 STS-2 40 97.99

UGM BHE BHN BHZ -- STS-2 20 93.49 TARA BH1 BH2 BHZ 10 STS-2 40 99.99

HK HKPS BHE BHN BHZ 00 STS-2 20 97.70 TRQA BH1 BH2 BHZ 10 CMG3-T 40 99.29

IC

BJT BHE BHN BHZ 00 STS-1H 20 99.63 YAK BHE BHN BHZ 00 STS-1H 20 99.82

ENH BHE BHN BHZ 10 STS-2 40 99.77

MY

KKM BHE BHN BHZ -- STS-2 20 99.38

HIA BHE BHN BHZ 00 STS-1H 20 99.62 KOM BHE BHN BHZ -- STS-2 20 99.42

LSA BHE BHN BHZ 10 STS-2 40 99.52 KSM BHE BHN BHZ -- STS-2 20 96.53

QIZ BHE BHN BHZ 01 STS-2 40 87.08 KUM BHE BHN BHZ -- STS-2 20 99.46

MN AQU BHE BHN BHZ -- STS-2 20 68.46 NZ OUZ HHE HHN HHZ 10 STS-2 100 98.70

VTS BHE BHN BHZ -- STS-1H 20 66.18

Example 1. Philippines: 2012-08-31 12:45:34, M7.6, record time

from 12:45:00 to 13:45:00; individual amplitude normalization

Example 2. DPRK 2013 event: 2013-02-12 02:57:50.8, mb4.9;

theoretical P travel times, iasp91, depth 0 km (red line); record time

from origin; individual amplitude normalization

AU_EIDS_BHZ

AU_GIRL_BHZ

AU_MANU_BHZ

AU_MCQ_BHZ

CU_GTBY_BHZ

DK_KULLO_HHZ

G_CAN_BHZ_00

G_CLF_BHZ_00

G_SPB_BHZ_00

G_TAM_BHZ_00

HK_HKPS_BHZ

IC_ENH_BHZ_10

IC_LSA_BHZ_10

IC_QIZ_BHZ_01

II_COCO_BHZ_10

II_EFI_BHZ_10

II_HOPE_BHZ_10

II_SHEL_BHZ_10

IU_FUNA_BHZ_10

IU_FURI_BHZ_00

IU_KBL_BHZ

IU_KNTN_BHZ_00

IU_OTAV_BHZ_00

IU_PTCN_BHE_01

IU_SAML_BHZ_10

IU_TARA_BHZ_10

IU_TRQA_BHZ_10

MN_AQU_BHZ

MN_VTS_BHZ

MY_KKM_BHZ

MY_KOM_BHZ

MY_KUM_BHZ

IC_ENH_BHZ_10

HK_HKPS_BHZ

IC_LSA_BHZ_10

IU_BILL_BHZ_00

MY_KKM_BHZ

AK_GAMB_BHZ

MY_KUM_BHZ

MY_KOM_BHZ

AU_MANU_BHZ

IU_KBL_BHZ

AK_COLD_BHZ

IU_TARA_BHZ_10

GE_DAG_BHZ

DK_KULLO_HHZ

GE_SUMG_BHZ

MN_VTS_BHZ

G_CAN_BHZ_00

MN_AQU_BHZ

IU_FURI_BHZ_00

IU_TRQA_BHZ

DATA

Disclaimer: The views expressed on this poster are those of the authors and do not necessarily reflect the view of the CTBTO Preparatory Commission or the European Union. SnT 2013

GA. A joint database was created for the following Global Association (GA) processing. It includes unions of tables, views and synonyms for the data

during 2011 from STATIC_REF, IDCX_REF, SEL3_REF and OSD VDEC database accounts. The primary IMS stations BJT and HIA were excluded

in the selection since there is no waveform data from these stations available during 2011. The OSD stations PALK, PTGA, RCBR, and YAK were

excluded in the selection since they exist as IMS auxiliary stations (the influence of continuous detections for these stations will be explored further). A

post SEL3 stage, called SELO (can be considered as sel4 stage), was configured for the joint GA processing. It includes 41 IMS primary stations , 96

IMS auxiliary stations and arrays, 50 OSD stations, 44 IMS hydroacoustic stations, and 50 IMS infrasound stations. The data were processed for 20

min intervals.

Acknowledgements: The work has been funded by the European Union.

RESULTS

𝐶 =𝑑𝑑𝑖𝑠𝑡

4

2

+𝑑𝑑𝑒𝑝𝑡ℎ

8+ 𝑑𝑡𝑖𝑚𝑒

2

Number of associated arrivals (2011)

Bull_comp. The results from SELO GA processing were

compared with SEL3_REF using the Bull_comp application

on the VDEC platform. The coefficient C, in seconds, was

used as the numerical value for comparison of two origins.

The figure represents the comparison between the number of origins in SEL3_REF for 2011 and SELO estimated as % of total number. The origins

were divided in 6 groups: I - equal with C ≤ 0.02; II - similar with 0.02 < C ≤ 100; III - medium differences with 100 < C ≤ 1000; IV - big differences

with C > 1000; V - presented only in SEL3; VI - presented only in SELO.

SEISMIC REGIONS (Flinn & Engdahl, 1964)

2011 42 Northeast Asia, North Alaska to Greenland 801 %

40 Arctic Zone 305 %

50 Antarctica 229 %

9 Extreme South America 226 %

41 Eastern Asia 206 %

35 Eastern South America 201 %

39 Pacific Basin 198 %

10 Southern Antilles 194 %

SEL3 origins

SELO origins

seismic regions

sta as/ar

% N arr N ass N dass N orig

av. time residual

average weight

AQU 1.7 43635 733 (516) 603 (399) 567 (380) 0.19 (0.42) 0.23(0.18)

ARMA 13.0 32232 4192(3622) 3450(2909) 3288(2765) 0.60 (0.71) 0.28(0.26)

ASCN 1.4 16285 228 (151) 211 (134) 205 (129) 0.10 (0.12) 0.36(0.31)

BILL 6.6 152184 10086(6824) 7687(4840) 7371(4585) -0.10(-0.14) 0.14(0.08)

BJT 13.9 56103 7818(6201) 5869(4346) 5623(4114) 0.22 (0.30) 0.10(0.04)

CAN 12.3 28222 3464(2982) 2785(2327) 2670(2222) 0.39 (0.47) 0.24(0.22)

CLF 2.0 71120 1399 (873) 1186 (715) 1116 (670) 0.20 (0.41) 0.28(0.25)

COCO 4.6 154949 7185(4540) 6106(3712) 5805(3465) -0.02 (0.01) 0.23(0.19)

COLD 8.6 144149 12365(8085) 9438(5771) 8914(5452) 0.30 (0.49) 0.15(0.09)

DAG 6.1 125141 7656(5536) 6011(4070) 5545(3742) -0.22(-0.25) 0.19(0.15)

DGAR 4.4 43064 1890(1155) 1776(1063) 1746(1037) -0.05(-0.08) 0.39(0.37)

EFI 5.5 22417 1232 (901) 1100 (773) 1073 (746) 0.07 (0.13) 0.30(0.27)

EIDS 10.5 52545 5493(4447) 4386(3408) 4236(3289) 0.32 (0.41) 0.22(0.18)

ENH 9.8 69180 6799(6194) 4976(4410) 4739(4186) 0.01 (0.04) 0.13(0.11)

FDF 1.4 30303 421 (257) 392 (230) 368 (211) 0.01 (0.08) 0.41(0.40)

FUNA 5.1 92877 4774(2664) 4372(2390) 4290(2328) -0.02(-0.03) 0.33(0.32)

FURI 3.2 20346 658 (480) 530 (364) 508 (344) 0.70 (0.87) 0.17(0.12)

GAMB 5.2 100366 5263(3286) 4191(2409) 3984(2273) 0.23 (0.41) 0.18(0.10)

GIRL 6.1 24768 1521(1173) 1393(1058) 1378(1044) 0.40 (0.42) 0.41(0.42)

GRM 2.7 29050 780 (560) 699 (482) 669 (453) 0.07 (0.14) 0.35(0.30)

GTBY 4.2 26742 1123 (708) 989 (588) 963 (569) 0.31 (0.41) 0.28(0.21)

HIA 8.1 50098 4070(3488) 3148(2591) 3021(2466) -0.01 (0.00) 0.15(0.11)

HKPS 9.4 13307 1248 (970) 1058 (795) 1030 (770) 0.42 (0.59) 0.25(0.22)

HOPE 1.9 108748 2091(1182) 1855 (999) 1709 (904) 0.05 (0.09) 0.32(0.25)

KBL 15.7 45216 7117(6225) 5092(4315) 4709(3986) 0.08 (0.09) 0.11(0.08)

KKM 1.9 39372 730 (591) 650 (512) 624 (491) 0.42 (0.55) 0.32(0.29)

KOM 2.6 66612 1699(1377) 1445(1137) 1370(1082) 0.36 (0.46) 0.29(0.27)

KSM 18.00 27140 4881(4463) 3778(3377) 3646(3248) 0.50 (0.58) 0.18(0.17)

KULLO 2.6 388661 10176(4405) 8795(3590) 8064(3276) -0.06(-0.06) 0.28(0.22)

KUM 12.0 38646 4627(3881) 3753(3039) 3544(2851) 0.24 (0.33) 0.22(0.19)

LSA 9.5 86351 8229(6290) 6429(4675) 6177(4458) 0.52 (0.71) 0.18(0.14)

MANU 3.1 159666 4957(3369) 3646(2315) 3406(2161) 0.10 (0.17) 0.11(0.04)

MCQ 0.5 112344 560 (282) 527 (258) 509 (248) -0.13(-0.08) 0.40(0.36)

MSVF 13.4 53864 7215(4985) 5699(3713) 5544(3595) 0.25 (0.40) 0.15(0.09)

OTAV 4.1 52004 2153(1396) 1810(1106) 1681(1023) 0.28 (0.44) 0.26(0.19)

OUZ 9.8 44059 4306(3423) 3618(2776) 3542(2706) 0.41 (0.55) 0.21(0.17)

PTCN 0.2 144835 253 (118) 228 (107) 203 (95) -0.03 (0.27) 0.44(0.41)

QIZ 7.0 33966 2373(1692) 2014(1359) 1960(1313) 0.46 (0.61) 0.26(0.21)

SAML 0.9 442031 4047(2855) 2873(1849) 2658(1716) 0.08 (0.11) 0.05(0.05)

SHEL 1.0 42588 442 (245) 406 (221) 392 (213) 0.06 (0.34) 0.35(0.31)

SPB 7.5 48757 3633(1943) 3189(1617) 3093(1535) 0.16 (0.25) 0.27(0.20)

SUMG 7.5 84288 6314(4869) 4884(3640) 4493(3339) 0.22 (0.29) 0.19(0.17)

TAM 6.5 86702 5608(3523) 4365(2492) 4219(2357) 0.39 (0.58) 0.16(0.07)

TAOE 1.0 45952 458 (260) 424 (233) 406 (226) -0.03 (0.01) 0.37(0.35)

TARA 4.9 154683 7644(4539) 6275(3494) 5958(3243) -0.03(-0.07) 0.18(0.11)

TAU 12.1 16129 1944(1345) 1766(1178) 1718(1132) 0.25 (0.33) 0.36(0.34)

TRQA 2.5 130637 3321(2621) 2678(2034) 2529(1906) 0.24 (0.32) 0.16(0.12)

UGM 7.8 33622 2608(1883) 2155(1470) 2029(1361) -0.04(-0.02) 0.25(0.20)

VTS 13.2 23913 3155(2696) 2347(1929) 2154(1759) 0.49 (0.56) 0.11(0.08)

OSD station performance. The results from OSD stations processing

were evaluated as several parameters, listed in the table: ratio between the

number of associated arrivals and number of detected arrivals as/ar (%);

number of detected arrivals Narr; number of associated arrivals Nass;

number of origin defining arrivals Ndass; number of origins; average time

residual (sec); average station weight. The best performance are marked with

green, the worst with red. The numbers in brackets refer to values for origins

with Nass ≥ 6. (Note: the IMS stations have weights between 0.8 and 1.0 and

the OSD stations were weighted by 0.7 in the GA processing).

Evaluation of origin determination. The origin parameters were

compared for the origins that exist in the both databases (SEL3_REF

and SELO) and are not equal (C > 0.02), taking into account the origins

from group II, III, and IV. The number of these origins is 42789 during

2011. Seven origin parameters were compared: ▪ epicenter – the

surface of the error ellipse, .a.b, where a is semi-major axis and b is

semi-minor axis of error ellipse in km; ▪ time – origin time error in sec;

▪ mb – magnitude uncertainty; ▪ E+T+M – epicenter, time and mb; ▪

depth – depth error; ▪ nass – number of associations; ▪ ndass – number

of defining associations. The “better” uncertainty means smaller

surface of the error ellipse, smaller time uncertainty, smaller mb

uncertainty, smaller depth uncertainty, bigger number of associations,

and bigger number of defining associations. “Not defined” uncertainty

means that there is only one measurement and no uncertainty could be

assigned.

number of associations ≥ 6

number of origins per sr > 10

Nsel3 / Nselo > 190 %

Number of origins in SEL3_REF and SELO (2011)

The ddist is the distance between the two

origins in km, ddepth – the depth difference

in km, and dtime – the time difference in

sec. The constants “4” and “8” are in km/s.

EU Council Decision IV