Role of the brittle–ductile transition on fault activation

Doglioni, Carlo; Barba, Salvatore; Carminati, Eugenio; Riguzzi, Federica

doi:10.1016/j.pepi.2010.11.005

Cited by 95 publications

(80 citation statements)

References 41 publications

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“…Normal fault-related crustal earthquakes, like all seismic events, are controlled by friction (Marone, 1998;Niemeijer et al, 2010;Ruina, 1983;Schleicher et al, 2010), fluid pressure, strain rate, brittle-ductile transition (BDT) depth, etc. However, unlike earthquakes generated by thrusts (e.g., Cooke and Murphy, 2004) and strike-slip faults, which are fed by elastic energy, normal faults release mostly gravitational potential energy (Dahlen, 1977;Dempsey et al, 2012;Doglioni et al, 2011Doglioni et al, , 2014Savage and Walsh, 1978) and for this reason they can be classified as graviquakes (Doglioni et al, 2015b). Since they work in favor of gravity, they show a different mechanical evolution with respect to other seismogenic faults that instead dissipate elastic energy accumulated during the interseismic period to move crustal volumes against (thrust) or at neutral (strike-slip) gravity.…”

Section: Introductionmentioning

confidence: 99%

Graviquakes in Italy

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Graviquakes in Italy

et al. 2015

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“…The b-value gradually decreases from depth 1 km up to 17-19 km, and then gradually increases up to the depth of 31 km. One of the possible interpretations of this pattern can be described using the concept of the hypothesis about existence in the earth's crust of the brittle-ductile transition zone (BDT) [8,9]. According to these works, with increasing of the depth the confining (lithostatic) pressure increases and increases the brittle strength of material.…”

Section: Discussionmentioning

confidence: 99%

“…Assumed that BDT zone is formed at depths of about 13-18 km, under the conditions, where a further increase of the brittle strength of material equals to the increase of ductile of the material at the overlying layers. Therefore, this zone is considered as the zone of the strongest part of the earth's crust where the majority of strong earthquakes occurs [8,9]. (Fig 3).…”

Section: Discussionmentioning

confidence: 99%

Gutenberg-Richter Law Parameters Analysis Using the Hellenic Unified Seismic Network Data Through FastBee Technique

Popandopoulos¹

2014

EARTH

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Abstract:The mapping of the minimum completeness magnitude Mc and parameters (a-and b-value) of the Guttenberg-Richter (G-R) law was studied for Greece territory and adjacent areas by using the new earthquakes catalog produced by the Hellenic Unified Seismological Network (HUSN). For the calculation of the parameters a-and b-values the visual method of the completeness magnitude (Mc) definition was used by means of FastBee technique. The results show that with the commissioning of the new network HUSN, the Mc have significantly decreased and have achieved the value M=1.5 in the central part of Greece and practically up to M=2.0 for the entire territory. Despite the short time of observation (11.2011-05.2014) the statistical reliable pattern of the spatial distribution of the G-R law parameters for territory of Greece was derived. In generally the spatial distributions of a-and b-value reflect the known seismotectonic structures of Greece. The distribution of the relatively low b-value coincides with the tectonic compression field which acts along the Hellenic Trench. The relatively low b-value is also observed on the northern-eastern part of Greece. The relatively high values of b-value meet mainly in the central Greece, where the extensional stress field dominates. The spatial pattern of the parameter a-value is reflecting the seismic activity of the under study region. The results of detailed analysis of b-value distribution with depth in the Corinthian Gulf area show that its values significantly decreased (from 1.6 to 0.76) in depth interval from 1 up to 17 km and then gradually increased up to 30 km. The pattern of b-value in depth distribution in this region was interpreted in the frame of hypothesis about the brittle-ductile transition zone existence. On the basis of this result, it is supposed that detailed study of the b-value distribution versus depth can be used for assessment of the focal depths of the impending strong earthquake. The present results show the applicability and the efficiency of the FastBEE technique for three dimension mapping of Mc and the G-R parameters.

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“…Accordingly, 21st century began with a lot of earthquakes that its great results include economic losses and social turmoil [25]and occurs when a large mass moves near the fault and this earthquake is known as a stage in the long-term and it was referred as the period of active fault [26].…”

Section: Natural Hazards With An Emphasis On Earthquakementioning

confidence: 99%

The Assessment of Sustainability Indicators in the Villagers’ Lives in Iran with Emphasis on Natural Hazards: A Case Study

Murgante¹,

Salmani²,

M³

et al. 2017

Preprint

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Natural hazards such as earthquakes take place around the world and when combined with human create natural disasters. Earthquake, as one of natural hazards, in recent years has caused the damage and the destruction of many rural areas with major losses in rural areas for the lack of sustainability in political, economic, social, physical and operational criteria. Thus, to overcome the damage caused by earthquakes in rural areas, the assessment of sustainability status seems necessary to plan and strengthen according to desirability of the status of sustainability indicators. This is a descriptive-analytical study; and data collection was conducted through field methods and questionnaires. To test the hypothesis, T statistical methods, correlation method and F-test were performed using SPSS software. The results of the study showed that villages were at a low and undesirable level under all aspects, except social index in terms of sustainability. Comparisons showed that there was a significant mean difference among villages in terms of sustainability. Also, the research concerns ranking of villages in terms of sustainability against earthquake hazard using multi-criteria decision methods. Finally, in order to improve sustainability indicators at the level of villages, some strategies were presented.

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Role of the brittle–ductile transition on fault activation

Cited by 95 publications

References 41 publications

Graviquakes in Italy

Graviquakes in Italy

Gutenberg-Richter Law Parameters Analysis Using the Hellenic Unified Seismic Network Data Through FastBee Technique

The Assessment of Sustainability Indicators in the Villagers’ Lives in Iran with Emphasis on Natural Hazards: A Case Study

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Role of the brittle–ductile transition on fault activation

Cited by 95 publications

References 41 publications

Graviquakes in Italy

Graviquakes in Italy

Gutenberg-Richter Law Parameters Analysis Using the Hellenic Unified Seismic Network Data Through FastBee Technique

The Assessment of Sustainability Indicators in the Villagers&rsquo; Lives in Iran with Emphasis on Natural Hazards: A Case Study

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The Assessment of Sustainability Indicators in the Villagers’ Lives in Iran with Emphasis on Natural Hazards: A Case Study