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    <title>UTas ePrints - Polarization filtering for automatic picking of seismic data and improved converted phase detection</title>
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    <meta content="Reading, A.M." name="eprints.creators_name" />
<meta content="Mao, W." name="eprints.creators_name" />
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<meta content="Polarization filtering for automatic picking of seismic data and improved converted phase detection" name="eprints.title" />
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<meta content="Data-adaptive polarization filtering is used to improve the detection of converted seismic phases. Both direct waves and mode-converted PS and SP arrivals may be more
easily picked on the filtered records. An autopicking routine is applied that cuts the polarization filtered traces according to the modelled traveltime of each phase through an initial structure. Use of forward-modelled, source-receiver times reduces the likelihood of an automatic pick being incorrectly made on spurious spikes in the polarization filtered trace. It is therefore a realistic way of automatically picking multiphase data
sets or, more generally, linearly polarized phases where low signal-to-noise ratios may be encountered. The method is suitable for any three-component seismic data and is here
applied to local earthquakes recorded in North Island, New Zealand. Intermediate energy is observed between the direct P and S arrivals due to phase conversion at the
interface between the Indo-Australian and subducting Pacific plates. The amplitudes of these converted arrivals are often too low for them to be identified above the P-wave
coda but polarization filtering of the records enables the yield of converted phase picks to be greatly increased." name="eprints.abstract" />
<meta content="2001-09" name="eprints.date" />
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<meta content="Geophysical Journal International" name="eprints.publication" />
<meta content="147" name="eprints.volume" />
<meta content="1" name="eprints.number" />
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<meta content="0956-540X" name="eprints.issn" />
<meta content="Adams, R. &amp; Ferris, B., 1976. A further earthquake at exceptional depth beneath New Zealand, Geophys. J. Int., 19, 269-273.
Allen, R., 1978. Automatic earthquake recognition and timing from single traces, Bull. seism. Soc. Am., 68, 1521-1532.
Allen, R., 1982. Automatic phase-pickers: their present use and future prospects, Bull. seism. Soc. Am., 72, S225-S242.
Ansell, J. &amp; Bannister, S., 1996. Shallow morphology of the subducted Pacific plate along the Hikurangi margin, New Zealand, Phys. Earth planet. Inter., 93, 3-20.
Bannister, S., 1988. Microseismicity and velocity structure in the Hawkes Bay region New Zealand: fine structure of the subducting Pacific plate, Geophys. J., 95, 45-62.
Bataille, K. &amp; Chui, J., 1991. Polarization analysis of high frequency,three-component seismic data, Bull. seism. Soc. Am., 81, 622-642.
Boschetti, F., Dentith, M. &amp; List, R., 1996. A fractal based algorithm for detecting first arrivals on seismic traces, Geophysics, 61, 1095-1102.
Calhaem, I., Haines, A. &amp; Lowry, M., 1977. An intermediate depth earthquake in the central region of the South Island used to determine a local crustal structure, N. Z. J. Geol. Geophys., 20,353-361.
Dai, H. &amp; MacBeth, C., 1995. Automatic picking of seismic arrivals in local earthquake data using an artificial neural network, Geophys. J. Int., 120, 758-774.
Earle, P. &amp; Shearer, P., 1994. Characterisation of global seismograms using an automatic-picking algorithm, Bull. seism. Soc. Am., 84,366-376.
Eberhart-Phillips, D. &amp; Reyners, M., 1999. Plate interface properties in the northeast Hikurangi subduction zone, New Zealand, from converted seismic waves, Geophys. Res. Lett., 26, 2565-568.
Fedorenko, Y. &amp; Husebye, E., 1999. First breaks-automatic phase pickings of P- and S-onsets in seismic records, Geophys. Res. Lett., 26, 3249-3252.
Gledhill, K., 1985. An earthquake detector employing frequency domain techniques, Bull. seism. Soc. Am., 75, 1827-1835.
Gledhill, K. &amp; Stuart, G., 1996. Seismic anisotropy in the fore-arc region of the Hikurangi subduction zone, New Zealand, Phys. Earth planet. Inter., 95, 211-225.
Hasegawa, A., Horiuchi, S. &amp; Umino, N., 1994. Seismic structure of the northeastern Japan convergent margin a synthesis, J. geophys. Res.,99, 22 295-22 311.
Helffrich, G. &amp; Stein, S., 1993. Study of the structure of the slab-mantle interface using reflected and converted seismic waves, Geophys. J. Int., 115, 14-40.
Jones, C. &amp; Phinney, R., 1998. Seismic structure of the lithosphere from teleseismic converted arrivals observed at small arrays in the southern Sierra Nevada and vicinity, California, J. geophys. Res., 103, 10 065-10 090.
Kayal, J., 1986. Analysis of strong phases other than P and S from a microearthquake survey in the Wellington region, New Zealand, Bull. seism. Soc. Am., 76, 1347-1354.
Klumpen, E. &amp; Joswig, M., 1993. Automated reevaluation of local earthquake data by application of generic polarization patterns for P-onset and S-onset, Computers Geosci., 19, 223-231.
Nakamura, M., Ando, M. &amp; Ohkura, T., 1998. Fine structure of deep Wadati-Benioff zone in the Izu-Bonin region estimated from S-to-P converted phase, Phys. Earth planet. Inter., 106, 63-74.
Park, J., Vernon, F. &amp; Lindberg, C., 1987. Frequency dependent polarization analysis of high-frequency seismograms, J. geophys. Res., 92, 12 664-12 674.
Patane, D. &amp; Ferrari, F., 1999. Asdp: a PC-based program using a multi-algorithm approach for automatic dectection and location of local earthquakes, Phys. Earth planet. Inter., 113, 57-74.
Reading, A.M., 1996. Deep lithospheric structure from multi-phase tomography: the subduction zone beneath southern North Island,New Zealand, PhD thesis, University of Leeds, Leeds.
Reading, A.M., Gubbins, D. &amp; Mao, W., 2001. A multiphase seismic investigation of the shallow subduction zone, North Island, New Zealand, Geophys. J. Int., 147, 215-226 (this issue).
Richardson, W., 1989. The Matata earthquake sequence of 1977, Bay of Plenty, New Zealand, PhD thesis, Victoria University, Wellington.
Roberts, R. &amp; Christoffersson, A., 1991. Seismic signal detection-a better mousetrap?, Bull. seism. Soc. Am., 81, 2511-2515.
Robinson, R., 1986. Seismicity, structure and tectonics of the Wellington region, New Zealand, Geophys. J. R. astr. Soc., 87, 379-409.
Ruud, B. &amp; Husebye, E., 1992. A new three component detector and automatic single-station bulletin production, Bull. seism. Soc. Am.,82, 221-237.
SAC, 1992. SAC, Seismic Analysis Code-Command Reference
Manual, Lawrence Livermore National Laboratory, CA.
Samson, J.C., 1973. Descriptions of the polarisation states of vector processes: applications to ulf magnetic fields, Geophys. J. R. astr. Soc., 34, 403-419.
Samson, J.C. &amp; Olson, J.V., 1981. Data-adaptive polarization filters for multichannel geophysical data, Geophysics, 46, 1423-1431.
Shearer, P.M., 1995. Seismic studies of the upper-mantle and transition zone, Rev. Geophys., 33, 321-324.
Smith, W.D., 1970. S to P conversion as an aid to crustal studies, Geophys. J. R. astr. Soc., 19, 513-519.
Stephens, C., Page, R. &amp; Lahr, J., 1990. Reflected and mode-converted seismic-waves within the shallow Aleutian subduction zone, southern Kenai Peninsula, Alaska, J. geophys. Res., 95, 6883-6897.
Stuart, G., Francis, D., Gubbins, D. &amp; Smith, G., 1995. Tararua broadband array, North Island, New Zealand, Bull. seism. Soc. Am.,85, 325-333.
Thirot, J., Montagner, J. &amp; Vinnik, L., 1998. Upper-mantle seismic discontinuities in a subduction zone (Japan) investigated from P to S converted waves, Phys. Earth planet. Inter., 108, 61-80.
Wagner, G. &amp; Owens, T., 1996. Signal detection using multi-channel seismic data, Bull. seism. Soc. Am., 86, 221-231.
Withers, M., Aster, R., Young, C., Beiriger, J., Harris, M., Moore, S. &amp; Trujillo, J., 1998. A comparison of selected trigger algorithms for automated global seismic phase and event detection, Bull. seism. Soc. Am., 88, 95-106.
Woodgold, C.R.D., 1999. Wide-aperture beamforming of depth phases by timescale contraction, Bull. seism. Soc. Am., 89, 165-177.
Zhao, Y. &amp; Takano, K., 1999. An artificial neural network approach for broadband seismic phase picking, Bull. seism. Soc. Am., 89,670-680." name="eprints.referencetext" />
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<meta content="Data-adaptive polarization filtering is used to improve the detection of converted seismic phases. Both direct waves and mode-converted PS and SP arrivals may be more
easily picked on the filtered records. An autopicking routine is applied that cuts the polarization filtered traces according to the modelled traveltime of each phase through an initial structure. Use of forward-modelled, source-receiver times reduces the likelihood of an automatic pick being incorrectly made on spurious spikes in the polarization filtered trace. It is therefore a realistic way of automatically picking multiphase data
sets or, more generally, linearly polarized phases where low signal-to-noise ratios may be encountered. The method is suitable for any three-component seismic data and is here
applied to local earthquakes recorded in North Island, New Zealand. Intermediate energy is observed between the direct P and S arrivals due to phase conversion at the
interface between the Indo-Australian and subducting Pacific plates. The amplitudes of these converted arrivals are often too low for them to be identified above the P-wave
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    <h1 class="ep_tm_pagetitle">Polarization filtering for automatic picking of seismic data and improved converted phase detection</h1>
    <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Reading, A.M.</span> and <span class="person_name">Mao, W.</span> and <span class="person_name">Gubbins, D.</span> (2001) <xhtml:em>Polarization filtering for automatic picking of seismic data and improved converted phase detection.</xhtml:em> Geophysical Journal International, 147 (1). pp. 227-234. ISSN 0956-540X</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/1594/1/Reading%2C_Mao%2C_Gubbins_2001.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/1594/1/Reading%2C_Mao%2C_Gubbins_2001.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />610Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="2059" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Data-adaptive polarization filtering is used to improve the detection of converted seismic phases. Both direct waves and mode-converted PS and SP arrivals may be more&#13;
easily picked on the filtered records. An autopicking routine is applied that cuts the polarization filtered traces according to the modelled traveltime of each phase through an initial structure. Use of forward-modelled, source-receiver times reduces the likelihood of an automatic pick being incorrectly made on spurious spikes in the polarization filtered trace. It is therefore a realistic way of automatically picking multiphase data&#13;
sets or, more generally, linearly polarized phases where low signal-to-noise ratios may be encountered. The method is suitable for any three-component seismic data and is here&#13;
applied to local earthquakes recorded in North Island, New Zealand. Intermediate energy is observed between the direct P and S arrivals due to phase conversion at the&#13;
interface between the Indo-Australian and subducting Pacific plates. The amplitudes of these converted arrivals are often too low for them to be identified above the P-wave&#13;
coda but polarization filtering of the records enables the yield of converted phase picks to be greatly increased.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">automatic picking, converted phase, New Zealand, polarization filtering.</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/260100.html">260000 Earth Sciences &gt; 260100 Geology</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1594</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Mrs Katrina Keep</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">13 Aug 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">30 Jan 2008 15:37</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=1594;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&amp;eprintid=1594">item control page</a></p>
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