4 research outputs found
Recommended from our members
Quality control for next-generation liquefaction case histories
The Next-Generation Liquefaction (NGL) database is an open-source, global database of liquefaction and non-ground failure case-histories. The database is part of a multi-year research effort with the main goal of developing improved procedures to evaluate liquefaction susceptibility, triggering, and consequences. In NGL, a case-history is defined as the intersection of three components: (1) a site, (2) an earthquake event, and (3) post-earthquake observations. The NGL database hosts case-histories used to develop existing liquefaction models, as well as new data derived from recent earthquakes such as the 2010-2011 Canterbury earthquake sequence, the 2011 Tohoku-Oki earthquake, and the 2012 Emilia earthquake. The database also hosts lateral spread case-histories, and a substantial number of liquefaction sites characterized by the presence of co-located recording stations. All of the data present in the NGL database are reviewed by the NGL Database Working Group. The NGL formal vetting process is described for an example case-history
Emergency response, intervention, and societal recovery in Greece and Turkey after the 30th October 2020, M-W=7.0, Samos (Aegean Sea) earthquake
On 30 October 2020, an M-w = 7.0 earthquake struck the Eastern Aegean
Sea with considerable impact on Samos Island in Greece and the area of
Izmir in Turkey. It was the most lethal seismic event in 2020 worldwide,
and the largest and most destructive in the Aegean Sea since the 1955
earthquake that also affected both countries. The Civil Protection
authorities in Greece and Turkey were effectively mobilized responding
to the earthquake emergency. The main response actions comprised initial
announcements of the earthquake and first assessment of the impact,
provision of civil protection guidelines through emergency communication
services, search and rescue operations,medical care, set up of emergency
shelters and provisions of essential supplies, psychological support, as
well as education, training activities and financial support to the
affected population. From the comparison of the Civil Protection
framework and the implemented response actions, it is seen that actions
at both sides of the eastern Aegean Sea, followed a single-hazard
approach in disaster management with similar response activities
coordinated by a main Civil Protection agency, which was in close
cooperation with the respective authorities at a national, regional and
local level. Based on the presented information, it is concluded that
the post-earthquake response and emergency management were satisfactory
in both countries, with valuable lessons learnt ahead of the next major
earthquake. To this end, many aspects can be further addressed to
enhance community resilience and introduce a multi-hazard approach in
(natural and man-made) disaster management
Recommended from our members
Quality control for next-generation liquefaction case histories
The Next-Generation Liquefaction (NGL) database is an open-source, global database of liquefaction and non-ground failure case-histories. The database is part of a multi-year research effort with the main goal of developing improved procedures to evaluate liquefaction susceptibility, triggering, and consequences. In NGL, a case-history is defined as the intersection of three components: (1) a site, (2) an earthquake event, and (3) post-earthquake observations. The NGL database hosts case-histories used to develop existing liquefaction models, as well as new data derived from recent earthquakes such as the 2010-2011 Canterbury earthquake sequence, the 2011 Tohoku-Oki earthquake, and the 2012 Emilia earthquake. The database also hosts lateral spread case-histories, and a substantial number of liquefaction sites characterized by the presence of co-located recording stations. All of the data present in the NGL database are reviewed by the NGL Database Working Group. The NGL formal vetting process is described for an example case-history
Recommended from our members
The role of site effects on elevated seismic demands and corollary structural damage during the October 30, 2020, M7.0 Samos Island (Aegean Sea) Earthquake
On October 30, 2020 14:51 (UTC), a moment magnitude (M) 7.0 (USGS, EMSC) earthquake occurred in the Aegean Sea. This paper presents the reconnaissance findings regarding the site effects on recorded strong ground motion intensities and duration, along with the resulting induced-structural damage in Izmir Bay and Samos Island, respectively. In all rock records, relatively high intensity long period rock spectral accelerations were observed in the mid to long period range of 0.5–1.5 s, which are attributed to the source, more specifically, to the slower rupture-mechanism of the event. These rich spectral intensities were further amplified by soil site effects and soil-superstructure resonance, leading to two to six times amplified overall responses and prolonged seismic shaking durations, more pronounced in Bayrakli and other Izmir Bay sites in Turkey. However, these amplified and prolonged excitations are still below design basis earthquake levels, which addresses the lack of proper structural design and construction deficiencies, as the underlying causes for the collapse to heavy damage performance of 795 buildings. On the other hand, although located only about 10 km from the rupture (22 km from the epicenter) and within the near fault zone, the town of Vathy on Samos Island (Greece) was rather lightly affected by the earthquake, with relatively few collapsed or heavily damaged buildings, partially attributed to the low height/low weight of structures in the area. However, a concentration of damage in low-rise buildings in Ano Vathy hill is considered indicative of a combination of coupled valley and topography effects on the strong motion. This event once again addressed the need to develop region-specific zonation and provisions, when more general code practices are proven to be inadequate to assess these extreme site effects