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Earthquake ground motion scenarios in urban areas: the case of the city of Thessaloniki (Northern Greece)

100%

Roumelioti Z. , Kiratzi A. , Theodulidis N. , Panou A. , Savvaidis A. , Benetatos C.

tom z. 5/80

303--317

A GIS approach to seismic risk assessment with an application to mining-related seismicity in Johannesburg, South Africa

84%

Liebenberg K. , Smit A. , Coetzee S. , Kijko A.

tom Vol. 65, no. 4

645--657

The majority of seismic activity in South Africa is related to extensive mining operations, usually in close proximity to densely populated areas where a relatively weak seismic event could cause damage. Despite a significant decrease in mining operations in the Witwatersrand area, the number of seismic events appears to be increasing and is attributed to the acid mine drainage problem. The increased seismicity is raising concern amongst disaster management centres and in the insurance industry. A better understanding is required of the vulnerability and the size of the potential loss of people and infrastructure in densely populated Johannesburg and its surrounding areas. Results of a deterministic seismic risk, vulnerability, and loss assessment are presented by making use of a geographic information system (GIS). The results illustrate the benefits of using GIS and contribute to a better understanding of the risk, which can assist in improving disaster preparedness.

Use of GIS for the preparation of an action plan for seismic risk management in the city of Thessaloniki

84%

Axioti H. , Doukas I. , Savvaidis P.

tom z. 5/80

363--372

Spatial analysis of b-value variability in Elazig city and the surrounding area (Eastern Turkey)

67%

Polat G.

tom Vol. 70, no 1

15--25

Frequency-magnitude distribution was investigated in Elazig city and the surrounding area (coordinates ranging from 38.1° N to 39° N for latitudes and 39° E to 40° E for longitude) to reveal the present-day crustal stress within the region. For this study, a complete set of 5603 earthquakes of Md≥1 from 1 January 2000 to 31 August 2020 were localized from the Bogazici University, Kandilli Observatory and Earthquake Research Institute, Regional Earthquake-Tsunami Monitoring Center (KOERI) catalogue. For the whole study region, spatial mapping of the frequency-magnitude distribution was thus produced. The frequency-magnitude distribution (b-value) for seismicity within the study area was not homogeneous. Outstanding variations in the b-value were detected with b ranging from b≈slightly more than 0.3–2. In this region, low b-values are mostly dominant in the region except for a few local areas. This study also shows that accumulated stresses are high particularly at the Pütürge segment in contrast to the fault drawn in the south, which represents the main thrust belt that runs through Hani-Lice and stretches to Çüngüş. As expected, stress accumulation in reverse faults is fairly higher. However, the sharing of the tension formed in the compression zone of the Arabian Plate and the Anatolian plate (i.e. stress partitioning in a sense), results in a low share in the reverse fault belt.