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Special Issue “The Next Marmara Earthquake: Disaster Mitigation

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Special Issue “The Next Marmara Earthquake: Disaster Mitigation Hori et al. Earth, Planets and Space (2017) 69:65 DOI 10.1186/s40623-017-0648-9 PREFACE Open Access Special issue “The next Marmara earthquake: disaster mitigation, recovery, and early warning” Takane Hori1*, Ali Pinar2, Ocal Necmioglu2, Muneo Hori3 and Azusa Nishizawa4 Te Marmara Sea, accommodating the fault segments of with Mw = 7.25 on the Main Marmara Fault is expected a major transform fault, is well known as a seismic gap to heavily damage or destroy 2–4% of the near 1,000,000 along the North Anatolian Fault (NAF), running through buildings in Istanbul, which has a population of around the northern part of Turkey and connecting the East 13 million, with 9–15% of the buildings receiving Anatolian convergent area with the Hellenic subduction medium damage and 20–34% of the buildings lightly zone (e.g., Pınar 1943; Toksöz et al. 1979; Pondard et al. damaged (Erdik 2013). 2007; Şengör et al. 2014). It is obvious from historical Te aim of this special issue is to gather information records spanning more than 2000 years that the region about the risk of another Marmara earthquake from the is subject to frequent strong shaking that is likely associ- latest geophysical, geological, geotechnical, computa- ated with tsunami waves, threatening heavily populated tional, and building science research results to discuss and industrialized locations (Ambraseys 2002; Erdik et al. ways of mitigating disaster in advance. Te collection 2004; Hébert et al. 2005). In the twentieth century, mag- of 12 papers constituting this special issue is based on nitude (M) 7-class earthquakes sequentially occurred recent research on imaging the crustal structure, the from east to west along the NAF zone, as shown in Fig. 1 geometry of the fault segments and their microseismic- (Stein et al. 1997). Te last two successive events hit the ity features, source characteristics of large earthquakes eastern Marmara region in August 17 and November 12, inferred from historical seismograms, tsunami hazard 1999, known as Izmit (Mw = 7.5) and Düzce (Mw = 7.2) assessment and mitigation studies, site response evalua- earthquakes, respectively, killing about 20,000 people and tions, and development of an integrated earthquake sim- devastating the region. On the other hand, at the west- ulation system. ern edge of Marmara Sea, an M ~ 7 earthquake occurred Polat et al. (2016) portrayed a tomographic image of the in 1912, rupturing onshore and ofshore fault segments crust beneath the Sea of Marmara and its close surround- where 4–5 m lateral displacements were measured ing area, derived from a dataset of more than ninety thou- (Armijo et al. 2005; Aksoy et al. 2010). Furthermore, in sand P- and S-wave arrival times from local earthquakes the Marmara Sea, it has been considered that the last M7 recorded at land-based stations and ocean bottom seis- class earthquake occurred in 1766. With an average slip mographs. Teir seismic velocity images illustrate positive rate of 2 cm/year, several meters have accumulated over anomalies nearby the fault segments of NAF, correlating the past 250 years (Straub 1996; Meade et al. 2002). Based with regions of higher seismicity. Te study of Yamamoto on a time-dependent model that includes the coseismic et al. (2015) closely inspects the NAF segments beneath and post-seismic efects of the 1999 Kocaeli earthquake the Sea of Marmara, especially the fault geometry and with moment magnitude Mw = 7.4, Parsons (2004) con- their seismic activity carried out by the deployment of cluded that the probability of an earthquake with Mw > 7 15 OBS stations at locations close to the Main Marmara in the Sea of Marmara near Istanbul is 35–70% in the Fault (MMF). A deeper than previously known seismo- next 30 years. According to a 2011 study, an earthquake genic zone, extending to the lower crust, is one of the most striking features derived from the OBS observa- tions. Te ofshore seismic stations nearby MMF con- *Correspondence: [email protected] 1 Japan Agency for Marine-Earth Science and Technology, Yokohama, strained the depth, dip, and lateral extent of the seismicity Japan much better and, consequently, the geometry of the fault Full list of author information is available at the end of the article © The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Hori et al. Earth, Planets and Space (2017) 69:65 Page 2 of 4 Fig. 1 Surface rupture extent associated with major earthquakes along NAF segments. Te geometry between the fault segments and based probabilistic seismic hazard analysis (PSHA) the orientation of the maximum horizontal compressive methodology where broadband strong ground motion stress axis is correlated through the frictional strength of simulations are conducted. To generate the high-fre- faults in the study presented by Pinar et al. (2016). Tey quency (0.5–20 Hz) part of the broadband earthquake use the frequency distribution of P- and T-axes of the simulation, real, small-magnitude earthquakes recorded focal mechanisms of events taking place around three by a local seismic array were used as empirical Green’s fault segments in the eastern Marmara. A low frictional functions. As for frequencies below 0.5 Hz, the synthetic coefcient for the Princes’ Islands segment and high fric- Green’s functions are calculated by an explicit 2D/3D tional coefcients for the Yalova-Çınarcık and Yalova- elastic fnite diference wave propagation routine. Hersek segments are derived by the authors. Aytore et al. (2016) used NAMI-DANCE code to carry Further information on the fault segmentation of NAF out high-resolution tsunami simulations in the Mar- in the Marmara Sea and north Aegean Sea regions is mara Sea, focusing on Haydarpaşa Port in the megacity determined by modeling the waveforms at broadband of Istanbul, and computed the tsunami parameters in land stations to retrieve the source properties of moder- and around the port. Tey observed that the stability of ate to large events, estimating the CMT parameters and the breakwaters is one of the major factors that infuence source time functions (Nakano et al. 2016). Te source whether agitation and inundation can be diminished in time function of the 2014 North Aegean earthquake the event of a tsunami in Haydarpaşa Port, as harbor pro- (Mw = 6.9) provides evidence on ruptures of diferent tection structures have not been designed to withstand fault segments associated with the mainshock. Moreo- tsunamis. Te fow depth, momentum fuxes, and current ver, the CMT solutions derived for the events taking pattern were identifed as the other factors that cause place along the MMF fault indicate fault parallel T-axis unexpected circulation and uncontrolled movements orientations, suggesting segmentation and development of objects on land and vessels in the sea. Cankaya et al. of local extension features. Baştürk et al. (2016) relocated (2016) applied a new methodology in Yenikapı region as two ancient moderate-sized earthquakes, using historical a case study for tsunami vulnerability assessment, based seismograms of events occurring in 1935 in the proximity on high-resolution coastal inundation modeling. Using of Marmara Island. Applying modern techniques to the NAMI-DANCE code, they constructed vulnerability old seismograms, CMT parameters for the two events at location and evacuation resilience maps, using the are retrieved that indicate predominantly normal fault- analytical hierarchical process (AHP) method of multi- ing mechanisms taking place at the upper crust. Similar criteria decision analysis (MCDA) to defne the tsunami source parameters are obtained for the 1963 Çınarcık human vulnerability of the region. Te vulnerability at earthquake, whose location was long a subject of debate. location map is composed of metropolitan use, geology, Te location of the fault segment ruptured by the 1963 elevation, and distance from shoreline layers, whereas earthquake and its source mechanism is of great impor- the evacuation resilience map considers slope, distance tance in seismic hazard assessment studies. Mert et al. within fat areas, distance to buildings, and distance to (2016) tried to predict the strong ground motions to be road networks layers. Following this, they computed the generated by a rupture on the Princes’ Islands segment, tsunami risk map from the proposed new relationship, which lies beneath the Çınarcık basin, using physically which uses fow depth maps, vulnerability at location Hori et al. Earth, Planets and Space (2017) 69:65 Page 3 of 4 maps, and evacuation resilience maps. Necmioglu (2016) Te Marmara region, long ago identifed as a seismic indicated that in the absence of adequate post-earth- gap, is waiting for the impending major earthquake to quake assembly areas, especially in heavily urbanized rupture the MMF segments. Meanwhile, several studies Istanbul, citizens would be rushing to landfll assembly have been carried out to determine the seismic hazard and recreational areas in the coastal parts of the city after level, the fault geometry and segmentation, mitigation a major earthquake. To address this, he proposed a model of seismic risk, rapid response, and early warning. All for a tsunami warning system specifc for the Marmara these subjects are tackled in this special issue, making a region that is strongly coupled with the earthquake early valuable contribution on the existing information that is warning system and stakeholders of tsunami mitigation constrained by high-quality data acquired in the frame of activities, such as the local and regional components of the MarDIM project, a joint efort of Turkish and Japa- disaster and emergency management and civil protec- nese scientists fnancially supported by JICA, JST and the tion units.
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