Earthquake magnitudes revision from early instrumental records: Greece and southern Balkans, 1900-1910

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Published: 2025-09-26
DOI: https://doi.org/10.4401/ag-9288

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Ioanna Triantafyllou
Institute of Physics of the Earth’s Interior & Geohazards, Hellenic Mediterranean University

Abstract

Records from five Agamennone-type mechanical seismographs have been utilized for the first time to recalculate earthquake magnitudes in Greece and the southern Balkans from 1900 to 1910. Mainka and Wiechert seismometers were used for the Greek seismicity monitoring and the surface-wave magnitude, Ms, determinations of hundreds of earthquakes occurring for several decades after 1910.  Since the intermediate natural period (3.5-9.0 s) was a common feature of Agamennone, Mainka and Wiechert instruments, we utilized Agamennone trace amplitudes recorded from 1900 to 1910 and after calibration for post-1910 magnitudes we recalculated magnitudes for 52 shallow and intermediate-depth earthquakes with proxy-Ms ranging from 4.7 to 7.4. For some earthquakes the epicentral coordinates were also improved with the use of P-S travel-time curves and macroseismic information. The method is promising for magnitude determination of many small earthquakes recorded in Greece in the early instrumental period.

Article Details

Issue

Vol. 68 No. 4 (2025)

Section

Seismology
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How to Cite

(1)
Triantafyllou, I. Earthquake Magnitudes Revision from Early instrumental records: Greece and Southern Balkans, 1900-1910. Ann. Geophys. 2025, 68 (4), S446. https://doi.org/10.4401/ag-9288.

References