Unit:
Κατεύθυνση Εφαρμοσμένη Γεωλογία - ΓεωφυσικήLibrary of the School of Science
Author:
Sotiriadis John-Rafael
Supervisors info:
Παναγιώτης Παπαδημητρίου, Καθηγητής, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, ΕΚΠΑ
Original Title:
Η ηφαιστειακή δραστηριότητα κατά την περίοδο Απριλίου-Μαΐου 2018 (Κιλαουέα, Χαβάη) Επεξεργασία τοπικών σεισμολογικών δεδομένων κατά την κρίσιμη περίοδο και εκτίμηση του συντελεστή απόσβεσης
Translated title:
Volcanic activity during the period April-May 2018 (Kilauea, Hawaii) Processing of local seismological data during the critical period and estimation of the attenuation factor
Summary:
Volcanic activity in Kilauea, Hawaii in 2018 was an example of a violent eruption with the predominant features of the collapse of the Halemaʻumaʻu caldera and a series of linear eruptions in the Lower East Rift Zone (LERZ). The multidimensional monitoring of the volcano provided a number of observations that can be related to the course of seismic activity in order to draw safer conclusions about the course of the paroxysmal episode. The present dissertation used seismic waveform data from the Hawaii Volcanic Observatory (HVO) local area network, which is openly accessible from the International Seismic Data Provider node (IRIS). These data were used to detail the focal parameters of the events of the period April - May 2018. For the analysis of seismic signals, a waveform algorithm was used in a MatLab graphical environment, with the simultaneous execution of the 2002 Hypoinverse individual event algorithm (Klein, 2002). The division of the manually determined hypocenters into time periods, in combination with the ground deformation studies by the USGS, provided significant evidence of magma migration to the Leilani Estates area, where linear eruptions occurred in May 2018 (Neal et al., 2019). One of the main objectives of this dissertation was to estimate the factor of attenuation Qc and to investigate its spatial distribution. This estimate was made using the Coda Waves Decay Method based on the modified Aki and Chouet backscattering model and the calculations were performed using SEISAN software (Ottemöller et al., 2016) as well as software that was developed in the laboratory of seismology. In the conclusion of this dissertation, reference is made to the response to this volcanic eruption by the Hawaii Civil Protection and the USGS. Finally, future updates of this Volcanic Crisis Response Plan are proposed briefly, which were published over the last two years (2019-2021).
Main subject category:
Science
Keywords:
volcano, Kilauea, seismicity, seismic attenuation, crisis response
