Faculty of Natural Sciences and Mathematics

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Comparison of methods for macroseismic mapping: A case study of the 2016 Debarca-Plakenska earthquake
(University of Kragujevac, University Library, Serbia, 2025-09)
Andreeska, Monika
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Drogreshka, Katerina
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Najdovska, Jasmina
The isoseismal map can directly reflect the damage degree of an earthquake, and it is an image representation of a seismic influence field or ground motion intensity field. This paper presents a comparative analysis of three methods used for generating macroseismic maps: manual isoseismal drawing, geostatistical interpolation method kriging and deterministic interpolation method natural neighbor. The objective is to test whether more automated methods can support the process of macroseismic mapping and reduce the subjectivity involved in manually drawn isoseismal lines. The analysis is based on data collected from earthquake that occurred on May 21, 2016, in the epicentral area Debarca-Plakenska, in the Republic of North Macedonia. A total of 82 intensity points, based on the European Macroseismic Scale, were supplemented with 17 additional intensity II points to ensure adequate closure of the macroseismic field and enhanced interpolation accuracy. The findings underscore the importance of selecting interpolation methods based on data characteristics. This research highlights the importance of properly collecting complete macroseismic data. Through the calculation examples, the best choice for this case study is the kriging interpolation method, which can be used to directly build a macroseismic field through intensity points.
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SERIES OF EARTHQUAKES IN THE VLANDOVO EPICENTRAL AREA, MAY – JUNE 2009
(Institute of Knowledge Management, 2019)
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Drogreshka, Katerina
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Chernih, Dragana
<jats:p>Seismic activity occurred in the Valandovo epicentral area was manifested through a series of weak to moderate earthquakes from May to June 2009. During this period more than a 2000 earthquakes were recorded by the telemetric seismological network of the Republic of Macedonia (SORM) and seismological stations from neighboring countries. Many of these earthquakes were felt on the territory of the Republic of Macedonia, Greece and Bulgaria. The strongest earthquake, with local Richter magnitude ML=5.1 and epicentral intensity Io=VII EMS-1998 scale, was on May 24, 2009, at UTC 16h 17min. According to all instrumental data, our latest investigation of seismic activity parameters for this epicentral area pointed out the activity of Valandovo fault and focal parameters were determined.</jats:p>
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Seismic Activity in the Ohrid Epicentral Area in the Period between June-September 2017
(2019)
Dragana Chernih-Anastasovska,
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Drogreshka, Katerina
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SEISMICITY OF DEBAR EPICENTRAL AREA
(Institute of Knowledge Management, 2018-12-10)
Drogreshka, Katerina
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Chernih, Dragana
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<jats:p>Main neotectonic regions in the territory of the Republic of Macedonia are the Vardar zone, West Macedonia and East Macedonia. These regions, being developed within major, regional tectonic units, are permanently uplifting with different intensities. They also show differences in the seismic activity, which is the reason to treat them as separate seismic zones, named with the same names. Debar epicentral area belongs to the West Macedonia seismic zone. This epicentral area is presented by the sinking of Drim graben (valley), crisscrossed by neotectonic faults which coused strong earthquake in 1967y, with Richter magnitude ML=6.5 and intensity Io=IX degrees EMS–1998 scale. After 1900y several moderate (5.0≤ML≤5.9) and light (4.0≤ML≤4.9) and lot of small earthquakes with magnitude ML ≤3.9 are also observed. According to all instrumental data, our latest investigation of seismic activity parameters for this epicentral area pointed out the activity of Elbasan-Debar fault.</jats:p>
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INSTRUMENTATION IN SEISMOLOGICAL OBSERVATORY – SKOPJE MONITORING AND DATA PROCESSING
(Institute of Knowledge Management, 2019-07-26)
Najdovska, Jasmina
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Drogreshka, Katerina
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Chernih-Anastasovska, Dragana
<jats:p>The present activities in the field of earthquake seismology in Republic of North Macedonia are carried out by the Seismological Observatory at the Faculty of Natural Sciences and Mathematics, University "Sts. Cyril and Methodius" - Skopje, founded in 1957. Seismological Observatory in Skopje with telemetric network of digital seismological stations systematically monitors the seismic activity in the territory of Republic of North Macedonia and the bordering areas and also records the regional and teleseismic earthquakes. The instrumental seismological data at the Seismological Observatory in Skopje and at stations of its network have been always obtained by instrumentation which had followed the world trends. Actual scientific methods and, lately, the most sophisticated computer softwares have been used in analyses. Earthquakes with local magnitudes down to zero can be recorded and analyzed with the latest instrumentation by real time telemetric network data exchange and used softwares. The predominant hypocentral depths are less than 15 km. These data give opportunity for epicentral areas predefinition of the on the territory of Republic of North Macedonia, calculation of many source parameters and the mean velocity of the relative tectonic movement of the fault blocks, as well.</jats:p>
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SEISMIC ZONES AND SEISMICITY OF THE TERRITORY OF THE REPUBLIC OF NORTH MACEDONIA
(Institute of Knowledge Management, 2019-06-05)
Drogreshka, Katerina
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Chernih-Anastasovska, Dragana
<jats:p>According to all sources of data available to the Seismological Observatory the seismic activity in the Republic of North Macedonia is mainly tectonic, with the exception of weak collapse earthquakes. This seismic activity is caused by its affiliation to the Mediterranean area of the Alpine-Himalayan orogeny belt. Epicentral areas belong to the three main seismic zones, West-Macedonian seismic zone, Vardar seismic zone and East-Macedonian seismic zone. Three secondary seismic zones, transverse to the main seismic zones, are also defined. Each of these zones is characterized by а specific time and space distribution of earthquake locations, with frequent seismic microactivity, lot of minor to light earthquakes and very rare moderate to major earthquakes. Observed seismic activity on the territory of the Republic of North Macedonia has a main role for the evaluation of the seismic hazard of the specific territory.</jats:p>
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SEISMIC ZONES AND SEISMICITY OF THE TERRITORY OF THE REPUBLIC OF NORTH MACEDONIA
(Institute of Knowledge Management, 2019-06-05)
Drogreshka, Katerina
;
;
Chernih-Anastasovska, Dragana
<jats:p>According to all sources of data available to the Seismological Observatory the seismic activity in the Republic of North Macedonia is mainly tectonic, with the exception of weak collapse earthquakes. This seismic activity is caused by its affiliation to the Mediterranean area of the Alpine-Himalayan orogeny belt. Epicentral areas belong to the three main seismic zones, West-Macedonian seismic zone, Vardar seismic zone and East-Macedonian seismic zone. Three secondary seismic zones, transverse to the main seismic zones, are also defined. Each of these zones is characterized by а specific time and space distribution of earthquake locations, with frequent seismic microactivity, lot of minor to light earthquakes and very rare moderate to major earthquakes. Observed seismic activity on the territory of the Republic of North Macedonia has a main role for the evaluation of the seismic hazard of the specific territory.</jats:p>
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SEISMICITY OF DEBAR EPICENTRAL AREA
(Institute of Knowledge Management, 2018-12-10)
Drogreshka, Katerina
;
Chernih, Dragana
;
<jats:p>Main neotectonic regions in the territory of the Republic of Macedonia are the Vardar zone, West Macedonia and East Macedonia. These regions, being developed within major, regional tectonic units, are permanently uplifting with different intensities. They also show differences in the seismic activity, which is the reason to treat them as separate seismic zones, named with the same names. Debar epicentral area belongs to the West Macedonia seismic zone. This epicentral area is presented by the sinking of Drim graben (valley), crisscrossed by neotectonic faults which coused strong earthquake in 1967y, with Richter magnitude ML=6.5 and intensity Io=IX degrees EMS–1998 scale. After 1900y several moderate (5.0≤ML≤5.9) and light (4.0≤ML≤4.9) and lot of small earthquakes with magnitude ML ≤3.9 are also observed. According to all instrumental data, our latest investigation of seismic activity parameters for this epicentral area pointed out the activity of Elbasan-Debar fault.</jats:p>

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