| More


Views: 215 Downloads: 176
M. Moisidi, F. Vallianatos, J. Makris, P. Soupios, M. I. Nikolintaga
M. Moisidi, F. Vallianatos, J. Makris, P. Soupios, M. I. Nikolintaga


Main purpose of the present study is to investigate the dynamic characteristics of the remainings at the ancient city of Aptera (Chania) and identify the main damage mechanism, in order to evaluate the risk of structure damage or collapse in case of future events using microtremor recordings. Our study focuses on the application of HVSR method (Horizontal to Vertical Spectral Ratio) to microtremor measurements carried out in specific sites. Registrations have been performed by means of a tridirectional sensor Lennartz 3D-Lite (1 natural Hz frequency), connected with a 24-bit digital acquisition unit. A set of 10 time series of 800 second each, sampled at 125 Hz was recorded in several sites. The selected time windows of each time series were corrected for the base line and for anomalous trends, tapered with a cosine function to the first and last 5% of the signal, and band pass filtered from 0.5 to 20 Hz with cut off frequencies at 0.3 and 22 Hz. The same procedure performed for all sites and components and finally the H/V spectral ratios were computed. Most of the sites present significant amplification peaks in frequency around 2 Hz. Finally, electrical resistivity tomography was carried out. The extracted results clearly show a very complex subsurface geometry indicated by the presence of large-scale voids, which may possibly correspond to ancient reservoirs. In the present work we confirm that the archaeological site of Aptera in Chania consists of a very complex subsurface structure and that the results obtained by HVSR method and by resistivity method are very well correlated.

Full Text:



Bard, P.-Y., (1998). Microtremor measurements: a tool for site effect estimation? (Paper presented at the 2nd International Symposium on the effects of surface Geology on seismic motion-ESG98-held in Yokohama, Japan, December 1-3, 1998).

Bard, P.-Y., (1999). Local effects on strong ground motion. Physical basic and estimatiom methods in view of microzoning studies. Lectures presented at the Advanced Study Course, Kefallinia.

Castro, R.R., J.G. Anderson and S.K.Singh., (1990). Site response, attenuation and source spectra of S waves along the Guerrero, Mexico, subduction zone, Bull.Seismol.Soc.Am, 80,1481-1503.

Diagourtas D., Makropoulos, K., Tzanis Α., (2001), Comparative study of microtremor analysis methods. Pure and Applied Geophysics 158, 2463-2479.

Funicello, R., Lombardi, L., Marra, F., Paratto, M., (1995). Seismic damage and geological heterogeneity in Rome's colloseum area: are they related?, Annali di Geofisica, 38 (5-6), 927-937.

Jeffrey.M.Rahl., Fassoulas. Charalampos., Brandon.T. Mark., Exhumation of high-pressure metamorphic rocks within an active convergent margin, Crete, Greece: A field Guide.

Gallipoli,M.R.,Mucciarelli,M., Castro,R.R., Monachesi.G., Contri,P., (2004) Structure , soil-structure response and effects of damage based on observations of horizontal to vertical spectral ratios of microtremor, Soil dynamics and Earthquake Engineering 24, 487-495 .

Giampiccolo, E., Gresta, S., Mucciarelli, M., De Guidi, G., Gallipoli, MR., (2001), Information on subsoil geological structure in the city of Catania (Eastern Sicily) from microtremor measurements, Annali di Geofisica, Vol.44, No.1.

Mucciarelli M., (1998). Reliability and applicability of Nakamura's technique using microtremors: an experimental approach. J Earthquake Engng 2 (4), 625-638.

Mucciarelli M., Contri P., Monachesi G., Calvano G., Gallipoli M., (2001). An empirical method to assess the seismic vulnerability of existing buildings using the HVSR technique, Pure and Applied Geophysics 158, 2635-2647.

Nakamura, Y., (1989). A Method for Dynamic Characteristics Estimation of Subsurface using Microtremor on the Ground Surface. Quarterly Report of RTRI, Railway Technical Research Institute (RTRI), 30(1).

Nakamura, Y., Hidaka, K., Sato, S., Tachibana, M., (1995). Proposition of a Method for Pier Inspection Using Microtremor.Quarterly Report of RTRI, 36(1), ISSN 0033-9008.

Nakamura, Y., (1996). Real Time Information Systems for Seismic Hazards Mitigation UrEDAS, HERAS, PIC. Quarterly Report of RTRI, 37(3).

Nakamura, Y., (1997). Seismic Vulnerability Indices For Ground and Structures Using Microtremor, World Congress on Railway Research in Florence, Italy, November 1997.

Nakamura, Y., (2000). Clear identification of fundamental idea of Nakamura's technique and its applications, Proceedings of 12WCEE 2000.

Nogoshi, I., Igarashi, T.,(1971). On the amplitude characteristics of microtremor (Part 2), Jour. Seism. Soc. Japan, 24, 24-60 (in Japanese with English abstract).

Ojeda.A., Escallon. J., (2000) Comparison between different techniques for evaluation of predominant periods using strong motion records in Pereira Colombia, Soil Dynamics and Earthquake engineering, 20,137-143.


  • There are currently no refbacks.

Copyright (c) 2018 M. Moisidi, F. Vallianatos, J. Makris, P. Soupios, M. I. Nikolintaga

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.