Tsunami intensity scale based on wave amplitude and current applied to the French Riviera: the case study of local seismicity

2020 ◽  
Vol 102 (1) ◽  
pp. 219-248
Author(s):  
Laurie Boschetti ◽  
Mansour Ioualalen ◽  
Fatemeh Nemati ◽  
Stephan Grilli ◽  
Jean-Xavier Dessa ◽  
...  
2021 ◽  
Author(s):  
Marilia Gogou ◽  
Ioanna Triantafyllou ◽  
Spyridon Mavroulis ◽  
Efthimis Lekkas ◽  
Gerassimos A. Papadopoulos

<p>On October 30, 2020, an Mw=7.0 earthquake occurred offshore northern Samos Island (Eastern Aegean, Greece). It was felt over a large area extending from Samos to Peloponnese in Greece and from Izmir to Istanbul in Turkey. It triggered many earthquake environmental effects and damage to buildings resulting in 119 fatalities in both countries. Among the triggered phenomena, tsunami waves with maximum height ~3.35 m struck mainly the northern coastal part of Samos Island and then other islands in the Aegean Sea including Chios, Andros, Ikaria Islands, and the western coast of Turkey.</p><p>In order to assess the tsunami intensity in Samos Island, the Integrated Tsunami Intensity Scale (ITIS 2012) was applied. ITIS 2012 is a recently introduced 12-grade scale ranging from I (not felt) to XII (completely devastating) and it is based on the assessment of a large number of objective criteria, grouped in six categories (physical quantities, impact on humans, impact on mobile objects, impacts on infrastructure, environmental effects and impact on structures).</p><p>In this context, the above information and data were used for the October 30, 2020 tsunami in Samos. Observations and measurements during a field survey conducted in Samos shortly after the event by the authors were mainly used for assigning intensities. Moreover, other sources included eyewitness, photos and videos from locals capturing the type and the extent of the tsunami impact as well as reports on the qualitative and quantitative tsunami properties and impact on the natural and built coastal environment were also used. Based on the recorded data and information and the guidelines for applying ITIS 2012, tsunami quantities and impact on humans, mobile objects, coastal infrastructure, the natural environment and buildings were taken into account. All available data were added and edited in a database in Geographic Information Systems (GIS) environment, specially designed for the purpose of the study. Then, the respective tsunami intensities were assigned in the studied sites. Moreover, interpolation methods have been also used in order to obtain zones of different intensity in the inundated coastal areas. The results included an ITIS 2012 intensity map of Samos Island.</p><p>Based on the assigned intensities, the October 30, 2020 tsunami is characterized as a moderate to strong event with considerable impact on all ITIS 2012 categories. The spatial distribution and the amount of the tsunami effects along the coastal area of Samos enabled the compilation of an intensity map with high resolution indicating that this scale works well for modern events with large amounts of effects and related information. Moreover, the individual criteria of the ITIS 2012 successfully complemented each other resulting in a detailed, concise and precise intensity map.</p><p>This is the first time that the ITIS 2012 is applied for a modern tsunami with large amounts of effects in the Mediterranean Region and especially the Aegean Sea. The results could be used for a more effective disaster risk management and risk mitigation strategies for tsunami in the Mediterranean Sea.</p>


1963 ◽  
Vol 46 (6) ◽  
pp. 1267-1286 ◽  
Author(s):  
Richard A. Cone

The rat retina is uniform and contains almost exclusively rods. Therefore the rat eye, when uniformly illuminated, produces a gross electroretinogram (ERG) which is simply related to the activity of the individual retinal sources of the ERG. Characteristics of ERG's are shown on an intensity scale of the average number of quanta absorbed per rod per stimulus flash obtained by direct accurate measurement of all quantities involved. An independent check on the accuracy of these measurements is applied to pigment-bleaching data reported by Dowling (1963). When ERG characteristics are placed on this scale it is found that: (a) The b-wave can usually be observed when fewer than one out of two hundred rods absorbs a quantum, the threshold being determined by the noise of the preparation. (b) Near threshold the b-wave amplitude is proportional to intensity. (c) The a-wave appears when there are more than two to four absorptions per rod per flash. (d) The b-wave latency decreases with intensity, and the amplitude becomes proportional to the logarithm of intensity when fewer than one out of ten rods absorbs a quantum. This implies that the b-wave sources must combine excitation from more than one rod (probably more than seven). Therefore the b-wave cannot arise from independent rods or rod-bipolar synapses, but probably reflects activity of entire inner nuclear layer cells.


Author(s):  
Fantina Tedim ◽  
João Gonçalves

The November 1st 1755 earthquake remains the most powerful and destructive to hit Europe so far. Although frequently associated with the city of Lisbon, this earthquake caused similar or greater damage and casualties in the southwest of the Algarve, where the seismic intensity was estimated at IX-X Mercalli Intensity Scale. Some minutes later, a tsunami increased the dimension of the disaster. Using simple techniques of simulation, we estimated the potential impacts of the occurrence of a similar event to the 1755 tsunami nowadays in Portimão.


2016 ◽  
Vol 5 (1) ◽  
Author(s):  
Katerina-Navsika Katsetsiadou ◽  
Emmanuel Andreadakis ◽  
Efthimis Lekkas

The study applies the Integrated Tsunami Intensity Scale (ITIS<sub>2012</sub>) criteria to map the tsunami intensities distribution in the broader Ishinomaki area, for the 9 Mw March 11, 2011 event offshore Tohoku, Japan. Based on reports, satellite imagery and published information, impact data was mapped, intensity values were assigned and thematic impact maps (layers) were created for each of the ITIS<sub>2012</sub> six criteria categories. Most of the criteria result in a mosaic of intensities, which is in many cases due to lack of data, depending on the land use. Two methodologies were used to produce the final map. A land-use-based weighted overlay was applied integrating the six layers, resulting in a final map that rather shows damage tsunami assessment on Ishinomaki area. The second final map was produced using the maximum intensity grade throughout the six layers for each pixel. This map showed an excellent zoning filling in any gaps due to information lack in some layers and areas, with maximum intensity data from the others, highlighting the ITIS<sub>2012</sub> criteria complementarity and is the tsunami intensity map of the study area.


Author(s):  
Stan Nomis ◽  
Leslie Salvan ◽  
Raphaëlle Dreyfus ◽  
Franck Compagnon ◽  
Pierre Brigode

2021 ◽  
Vol 1 ◽  
pp. 721-729
Author(s):  
Maratus Sholikhah ◽  
Windha Widyastuti

AbstractAdolescents often experience dysmenorrhea during menstruation. One of the non- pharmacological methods implemented to reduce dysmenorrhea is Abdominal Stretching Exercise accompanied by classical music. The purpose of this study was to describe the implementation of Abdominal Stretching Exercise accompanied by classical music in reducing dysmenorrhea. This research was a case study with two adolescents experiencing dysmenorrhea as the participants. The instrument being used was a pain measurement observation sheet with the Numerical Pain Intensity Scale. The intervention given to the participants was the implementation of Abdominal Stretching Exercise accompanied by classical music for 10-15 minutes on the first and second days of dysmenorrhea. The result showed that the pain scale before and after the intervention in case 1 decreased from 5 to 0, and in case 2, it decreased from 7 to 1. In conclusion, the implementation of Abdominal Stretching Exercise accompanied by classical: music could reduce dysmenorrhea in adolescents. It is recommended that health workers can teach and implement Abdominal Stretching Exercises accompanied by classical music in reducing dysmenorrhea in adolescents.Keywords: Dysmenorrhea; Abdominal Stretching Exercise; classical music; teenagers AbstrakRemaja seringkali mengalami dismenore saat menstruasi. Cara non farmakologis yang dilakukan untuk menurunkan nyeri dismenore salah satunya adalah terapi abdominal stretching exercise yang diiringi musik klasik. Tujuan karya tulis ilmiah ini untuk menggambarkan penerapan abdominal stretching exercise yang diiringi musik klasik dalam menurunkan dismenore. Desain karya tulis ilmiah ini berupa studi kasus pada dua remaja yang mengalami dismenore. Instrumen yang digunakan adalah lembar observasi pengukuran nyeri menggunakan Numerik Pain Intensity Scale. Intervensi dengan menerapkan abdominal stretching exercise yang diiringi musik klasik selama 10-15 menit dilakukankan saat dismenore pada hari pertama dan kedua. Hasil menunjukkan sebelum intervensi skala nyeri pada kasus 1 yaitu 5 pada kasus 2 yaitu 7. Setelah intervensi skala nyeri pada kasus 1 yaitu 0 pada kasus 2 yaitu 1. Simpulan studi kasus adalah penerapan abdominal stretching exercise yang diiringi musik klasik dapat menurunkan dismenore pada remaja. Bagi petugas kesehatan disarankan dapat mengajarkan dan menerapkan abdominal stretching exercise yang diiringi musik klasik dalam menurunkan dismenore pada remaja. Kata kunci: Dismenore; Abdominal stretching exercise; Musik klasik; Remaja


2020 ◽  
Vol 980 ◽  
pp. 333-345
Author(s):  
Xian Ren Zeng ◽  
Shi Hui You ◽  
Fang Li ◽  
Bijan Rahmani

The zonal disintegration mechanism in rock masses around deep tunnels is totally controversial. Because this phenomenon basically depends on the stress-wave amplitude, fluctuating and declining in rock masses particularly around deep tunnels. This paper intends to theoretically solve the problem of stress-wave propagation. For this purpose, a physical model of stress-wave propagation is established in rock masses around the deep tunnels. Further, the wave equation is solved for rock masses of deep tunnels. Taking Dingji Tunnel in southern of China as a case-study, the central radius of partition is calculated theoretically and compared with the measured results in rock masses around deep tunnels. The research results of this paper gives a certain promotes to the theory of zonal disintegration in rock masses and have certain guiding significance for deep rock engineering.


2013 ◽  
Vol 103 (2B) ◽  
pp. 1493-1502 ◽  
Author(s):  
E. L. Lekkas ◽  
E. Andreadakis ◽  
I. Kostaki ◽  
E. Kapourani

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