An application of the coda methodology for moment-rate spectra using broadband stations in Turkey

Tuna Eken*, Kevin Mayeda, Abraham Hofstetter, Rengin Gök, Gonca Örgülü, Niyazi Turkelli

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


A recently developed coda magnitude methodology was applied to selected broadband stations in Turkey for the purpose of testing the coda method in a large, laterally complex region. As found in other, albeit smaller regions, coda envelope amplitude measurements are significantly less variable than distance-corrected direct wave measurements (i.e., Lg and surface waves) by roughly a factor 3-to-4. Despite strong lateral crustal heterogeneity in Turkey, we found that the region could be adequately modeled assuming a simple 1-D, radially symmetric path correction. After calibrating the stations ISP, ISKB, and MALT for local and regional distances, single-station moment-magnitude estimates (Mw) derived from the coda spectra were in excellent agreement with those determined from multistation waveform modeling inversions, exhibiting a data standard deviation of 0.17. Though the calibration was validated using large events, the results of the calibration will extend Mw estimates to significantly smaller events which could not otherwise be waveform modeled. The successful application of the method is remarkable considering the significant lateral complexity in Turkey and the simple assumptions used in the coda method.

Original languageEnglish
Pages (from-to)L11609 1-4
JournalGeophysical Research Letters
Issue number11
Publication statusPublished - 16 Jun 2004
Externally publishedYes


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