Department of Seismology
Seismological Services
The Bulletin of the Albanian Seismic Network (ASN) is the primary output of the Seismic Monitoring Process, a service offered by the Department of Seismology (DS), and is regarded as the definitive record of the Albanian local and regional seismicity.
To use this service product the product citation (starting from July 2009 it is indexed with ISSN : 2664-410X), is:
Monthly bulletin of seismology. Country: Albania. Medium: Online, ISSN : 2664-410X
DS database contains parametric data from 1974 to present, although scars data prior to 1974 have also added mainly from the International Seismological Centre Bulletin (ISC). The Reviewed DS Bulletin, which is manually checked by responsible staff, undergo repeated relocation (when there are sufficient data and/or model improvement), which is not a real-time process and is completed within a year of monitoring.
The Bulletin may be accessed in one of three ways:
- online web searches, which provides access to all DS Bulletin data, on subscription;
- monthly files (pdf) of the DS Bulletin from the IGEO http site;
- purchase hard copy or CD-ROMs with monthly files by request at IGEO;
Seismic Activity in South-Eastern Albania (Albania-Greece border region)
During the period 2022-2023 nearly 110 earthquakes have occurred on both sides of the active area, on Albanian and Greece territory.
This service, offered by the National Center of Seismic Monitoring (NCSM) within the Department of Seismology of Institute of Geoscience (IGEO), is an automated procedure of computing Moment Tensor components and determining the geometry of earthquake sources based on the Albanian Broadband Seismic Network (ASN - AC) and broadband stations from neighbor regional seismic networks, included based on well-established real time seismic data exchange policies with our partners. Automatic MT’s are provided within minutes after a significant event. The obtained results are detailed on the respective tab at https://www.geo.edu.al.
The MT inversion is done through GISOLA open source seismological software (Triantafyllis et al., 2016), a combination of two actual powerful tools, SeisComP and ISOLA (Sokos and Zahradník, 2008), an open-source Python based software for automatic MT calculation of seismic events provided by SeisComP4 software package,
The procedure is based on a multiple-point source representation, iterative deconvolution, full wave-field is taken into consideration, and Green's functions are calculated with the discrete wavenumber method as implemented in the Axitra FORTRAN code (Cotton and Coutant, 1997). Gisola is a highly evolved version of former programs (ISOLA, SCISOLA), oriented for High-Performance Computing, which applies enhanced algorithms for waveform data filtering via quality and various reference metrics for the frequency bands of interest, involving also a multiprocessing implementation for faster calculations, as properly referred.
REFERENCE: (Nikolaos Triantafyllis, Ioannis E. Venetis, Ioannis Fountoulakis, Erion‐Vasilis Pikoulis, Efthimios Sokos, Christos P. Evangelidis; Gisola: A High‐Performance Computing Application for Real‐Time Moment Tensor Inversion. Seismological Research Letters 2021; doi: https://doi.org/10.1785/0220210153)
Concerning the Green’s Functions computation, Gisola operates a newer version of the Axitra, and accounts for several input velocity structure models local and regional. The local model used for all local and regional events location is involved as well (Dushi & Havskov, 2021).
Dr. Edmond Dushi and Dr. Besian Rama implement a local implementation of GISOLA routinely (December 2022). The actual data flow, log tracing, configuration management and interactive solutions is managed and maintained by Dr. Besian Rama, while manual revise and final data quality check is managed by Dr. Edmond Dushi.
Results are published and shared to other regional and international Seismological Agencies, i.e. the Euro-Mediterranean Seismological Center (EMSC) and the International Seismological Center (ISC).