Tolga Gorum

Istanbul Technical University · Eurasia Institute of Earth Sciences

High Anatolian orographic margins have large variations in terms of topographic relief, precipitation, and uplift rate. These variations lead to the dynamics of mass movements and surface runoff, which are the dominant geomorphological processes in ice-free mountain landscapes. There is growing recognition that large landslides are important agents...

A precise, accurate and complete landslide inventory is indispensable for the establishment of reliable landslide susceptibility and hazard maps. In the preparation of landslide inventories, dense vegetation cover is the major obstacle that confounds the topographic signature of landslides. Today, the growing usage of light detection and ranging (L...

Despite longstanding research on the landslide hazard assessment and mapping, the use this information in regional planning applications remains largely unclear. There is still a need for novel methods to interpret the results of hazard analyses. In this respect, the main research question of this study is how the landslide hazard maps can be evalu...

Landslides are one of the devastating geohazards that cause extensive socioeconomic and environmental damages on local, regional, and global scales. Previous studies based on digital media sources have attracted attention to the high fatal landslide rate in Turkey, at a continental or global scale; however, the preparation of a comprehensive and lo...

Roads can have a significant impact on the frequency of mass wasting events in mountainous areas. However, characterizing the extent and pervasiveness of mass movements over time has rarely been documented due to limitations in available data sources to consistently map such events. We monitored the evolution of a road network and assessed its effe...

Morphometric studies of scoria cones have a long history in research. Their geometry and shape are believed to be related to evolution by erosion after their formation, and hence the morphometric parameters are supposed to be related with age. We analysed 501 scoria cones of four volcanic fields: San Francisco Volcanic Field (Arizona, USA), Chaîne...

Over time, river networks achieve a specific pattern as determined by the function of several factors such as climate, tectonic, geological structures, topography, lithology, and base-level fluctuations. The relative importance of mentioned factors on drainage systems was studied to determine the controlling factors of their heterogeneity across th...

Tectonics imparts a first-order control on the overall morphology of alluvial fan systems in extensional settings by influencing sediment flux and accommodation space, while other factors such as climate, catchment lithology, and fault footwall characteristics are secondary. Previous alluvial fan modeling studies have focused on the link between th...

Badlands are extremely rugged, outstanding landscapes that can be seen in all ice-free climate regions over erosion-susceptible unconsolidated materials, and they have drawn attention with their spectacular and iconic forms. Unlike nearly all badlands researches conducted at the experimental site and watershed scale, so far, the broader-scale evalu...

The formation of badlands is commonly linked to the presence of dispersive deposits. Meanwhile, the sediments having more resistance to disintegration might also cause badlands formation given the time and adequate climate conditions. Although the notable influences of climate conditions have been highlighted on badlands morphologies so far, only a...

The Namaras rock avalanche (NRA) deposit originated from the northern flank of the glaciokarstic Geyikdağ Mountain in the Central Taurus Range, SW Turkey. The deposit has an area of ~0.430 km² and an estimated average thickness of 10 m, corresponding to 4.3 million m³ volume. The fan-shaped deposit area consists of house-sized Jurassic-Cretaceous n...

On November 14, 2016, the northeastern South Island of New Zealand was hit by the magnitude Mw 7.8 Kaikōura earthquake, which is characterized by the most complex rupturing mechanism ever recorded. The widespread landslides triggered by the earthquake make this event a great case study to revisit our current knowledge of earthquake-triggered landsl...

To understand the factors that make certain areas especially prone to landslides, statistical approaches are typically used. The interpretation of statistical results in areas characterised by complex geological and geomorphological patterns can be challenging, and this makes the understanding of the causes of landslides more difficult. In some cas...

The extensive gypsum karst of Sivas, Turkey is one of the most outstanding examples of bare gypsum karst in the world. It displays a number of remarkable geomorphic features, including: (1) two stepped planation surfaces cut-across folded gypsum developed during an initial phase of slow base level deepening punctuated by periods of stability; (2) u...

Earthquakes increase landslide susceptibility in post-seismic periods. The time required for restoring pre-earthquake susceptibility levels is defined as landslide recovery time. Overall, stronger earthquakes are associated with relatively long recovery times in the literature. However, the seismic effect does not explain the whole process. This pa...

Earthquakes do not only trigger landslides in co-seismic phases but also elevate post-seismic landslide susceptibility either by causing a strength reduction in hillslope materials or by producing co-seismic landslide deposits, which are prone to further remobilization under the external forces generated by subsequent rainfall events. However, we s...

In this study, the high-resolution palynological data derived from two cores taken from Mogan Lake in the Gölbaşı Basin of the Ankara region in central Anatolia (Turkey) are presented. The results provide the palaeobotanical, palaeoclimatological and palaeoenvironmental records of the last ca. 3100 years for the region which is characterised by ric...

z: Fayların kayma hızı ve geometrisi, bölgesel deformasyon paterninin daha iyi anlaşılması için kritik öneme sahiptir. Ayrıca normal bir fayın düşey kayma hızının belirlenmesi, o fayın aktivitesinin belirlenmesinde önemli parametrelerden biridir. Yüksek açılı normal faylar, Men-deres Masifi'nin temel aktif tektonik yapılarındandır. Özellikle Aydın...

Badland areas are present in all continents, excluding Antarctica, and play a critical role in establishing local erosion and sedimentation rates. The presence of unconsolidated rocks (e.g., marls, sandstone, mudstone etc.) is a major driver controlling the distribution of badlands, which together with other environmental components, such as climat...

Along the western flank of the northern margin (Central Pontides) of the Central Anatolian Plateau, the humidity from the Black Sea is much higher than the central and eastern flanks and creates a complex relationship between surface and tectonic processes by triggering intense mass wasting activity and aggradation within narrow valleys. We identif...

The main purpose of the study is to determine the general characteristics of the landslide sizes observed in Cretaceous and Eocene aged flysch assemblages at the Western Black Sea region of Turkey by using magnitude and frequency relations. For this purpose, the magnitude and frequency relations were investigated by considering power-law scaling ch...

Morphological changes, caused by the erosion and deposition processes due to water discharge and sediment flux occur, in the banks along the river channels and in the estuaries. Flow rate is one of the most important factors that can change river morphology. The geometric shapes of the meanders and the river flow parameters are crucial components i...

Large rock-slope failures are among the primary geohazards in high mountain areas. These rock avalanches and rockslides constitute most of the world’s largest landslide deposits. This study focuses on the formation and geomorphological activity of the Akdag landslide complex located on the southern slope of Mount Akdag, SW Turkey. We employed detai...

Türkiye'de her yıl onlarca kişinin ölümüne neden olan çok sayıda heyelan olayı meydana gelmekte-dir. Ancak Türkiye'de gerçekleşen heyelan olaylarının bu yönüyle ele alınması ve ölümlerin kayde-dilmesi günümüze kadar ihmal edilmiştir. Bu kapsamda, 1929'dan 2019'a kadar Türkiye'de ölümcül heyelan olaylarını kapsayan bir veri tabanı, önceden belirlenm...

Call for special issue on "Application of Remote Sensing and GIS in Earthquake-Triggered Landslides". Publisher – Frontiers in Earth Science https://www.frontiersin.org/research-topics/14474/application-of-remote-sensing-and-gis-in-earthquake-triggered-landslides

We present the first detailed Quaternary landform map of the Büyük Menderes Graben System, located in western Turkey which is one of the most active extensional domains in the world. The main map was produced with a combination of TanDEM-X (12.5 m resolution), Red Relief Image Map, unmanned aerial vehicle, Google Earth images, and multiple fieldwor...

We present the first detailed Quaternary landform map of the Büyük Menderes Graben System, located in western Turkey which is one of the most active extensional domains in the world. The main map was produced with a combination of TanDEM-X (12.5 m resolution), Red Relief Image Map, unmanned aerial vehicle, Google Earth images, and multiple fieldwor...

Badlands are unique landscapes that are extensively developed on unconsolidated sediments or poorly consolidated bedrocks that are covered by little or no vegetation. They are widely observed landscapes in Turkey similar to arid and semi-arid regions of the world. Turkish badlands are commonly formed on Miocene and Plio-Quaternary deposits, especia...

Landslides are one of the destructive geomorphological hazards that cause substantial socioeconomic and environmental damages on a global scale. Knowing the precise number of deaths caused by landslides and their spatial and temporal distributions will facilitate a better understanding of the losses and damages, and further to prevent and minimize...

Reliable historical inventories, including past landslide events, are crucial in understanding the future landslide hazards and risks. In this study a new data set of landslides that caused loss of life in the 90-year period from 1929 and 2019 has been compiled, providing new insight into the impact of landslides for Turkey, which is Europe's...

Landslides are one of the geomorphological hazards that cause significant human, economic and natural losses worldwide and in Turkey as well. In general, landslides triggered by natural factors such as earthquakes, heavy rainfall and snow melting, or human activities cause a large number of casualties. Knowing the precise number of deaths caused by...

FATALDOT inventory indicates that in the 90 years, a total of 1343 people lost their lives across the region in 389 landslide events in Turkey between 1929 and 2019. The distribution of the fatal landslides is highly varied and concentrated in two distinct zones along with the Eastern Black Sea Region and Istanbul mega-city. Our analysis sugg...

Landslides are one of the geomorphological hazards that cause significant human, economic and natural losses worldwide and in Turkey as well. In general, landslides triggered by natural factors such as earthquakes, heavy rainfall and snow melting, or human activities cause a large number of casualties. Knowing the precise number of deaths caused by...

Landslides are one of the destructive geomorphological hazards that cause substantial socioeconomic and environmental damages on a global scale. Knowing the precise number of deaths caused by landslides and their spatial and temporal distributions will facilitate a better understanding of the losses and damages, and further to prevent and minimize...

Various mechanisms are proposed to explain landslide recovery time in the time following major earthquakes. However, research on prescribing possible recovery times following an earthquake is still relatively new. This paper provides an insight into factors governing landslide recovery time, which could be considered as a step forward in predictive...

The conference paper is about morphometric characteristics of Badlands in the Cappadocia.

Nowadays, one of the most popular measuring platforms, increasingly applied in many applications is Unmanned Aerial Vehicles (UAVs) that can carry a variety of payloads, are automatically or the remote control system operated with the existing power system. UAVs provide high resolution data with photogrammetric flight plans realized with various se...

Western Anatolia is one of the rapidly extending areas on the earth. The Menderes Massif has an actively deforming horst-graben structure in the Western Anatolian Extentional Province. The high-angle normal faults are the principal active tectonic structures of the Menderes Massif. Especially, the southern margin of the Aydın Block is characterized...

The Menderes Massif is an actively deforming horst-graben structure in the Western Anatolian Extentional Province. Nevertheless, the rate and pattern of Quaternary deformation of the massif poorly understood. In this study, we focus on Quaternary landforms and deposits that surround southern flank of the Aydın Block. Our approach is mapping and dat...

Landslides are one of the geomorphological hazards that cause significant human, economic and natural losses worldwide and in our country as well. In general, landslides triggered by natural factors such as earthquakes, heavy rainfall and snow melting, or human activities cause a large number of casualties. Although many studies have been carried o...

Western Anatolia is one of the rapidly extending areas on the earth. Menderes Massif in Western Anatolia has been experiencing uplift above the South Aegean arc since the Neogene. However, quantitative dating studies on determine the rock uplift or surface uplift of the Central Menderes Massif has not yet been perform. The primary goal of this stud...

Landslide events occurs on all continents in the world and play an important role in topographic relief development, denudation and sediment flux. At the same time, it is one of the common natural hazards that causes loss of life and property for many parts of the world. Landslides cause major disasters on a global scale every year and their incide...

Doğal afetler, dünya genelinde insan hayatı üzerinde ciddi bir tehdit oluşturmaktadır. Depremler, kasırgalar veya sel-taşkın gibi can ve mal kaybına neden olan doğal afetlere ait veri setleri, yüksek bir doğruluk derecesi ile küresel ölçekte kapsamlı olarak kaydedilmektedir. Son dönemdeki çalışmalar, heyelanların dünya genelinde hem boyutlarında he...

İnsansız Hava Araçları (İHA), mevcut güç sistemi ile otomatik olarak ya da uzaktan kumanda sistemi yardımıyla uçurulan ve faydalı yük taşıyabilen pilotsuz hava araçlarıdır. İHA’lara entegre edilmiş algılayıcılar, çalışma alanları için hazırlanan fotogrametrik uçuş planları ile otomotik uçuşlar gerçekleştirilerek düşük maliyet ve işgücünün yanı sıra...

Quaternery geological and geomorphological units are crucial to trace active tectonic deformation. Mapping of the Quaternary units in tectonically active areas greatly contributes to understand active tectonic and also landscape evolution. The Western Anatolia extensional province is a rapidly deforming and seismically active domain in the World. M...

Orogenic belts are a system of complex connections and feedbacks where climatic, tectonic and erosional processes play significant roles. Orogenic systems affect not only the carbon cycle and thereby the climate change through regional uplift, physical and chemical weathering and also contributes to the soil formation via the sediments they produce...

The Sinop Peninsula is located at the northernmost part of the Asia Minor (Anatolia). Its geographic position between the Central Pontide Mountains and the Black Sea together with the presence of young geological units and landforms provides favorable conditions for understanding onshore and offshore geological and geomorphic processes acting along...

This conference paper is on large (> 1 km2) bedrock landslides and their geomorphic impacts along the northern margin of the Anatolian Plateaus.

The Black Sea Region is one of the most landslide prone area due to the high slope gradients, heavy rainfall and highly weathered hillslope material conditions in Turkey. The landslide occurrences in this region are mainly controlled by the hydro-climatic conditions and anthropogenic activities. Rapid regional landslide inventory mapping after a ma...

Earthquake-triggered ground failure, such as landsliding and liquefaction, can contribute significantly to losses, but our current ability to accurately include them in earthquake-hazard analyses is limited. The development of robust and widely applicable models requires access to numerous inventories of ground failures triggered by earthquakes tha...

Landslide susceptibility and hazard generally comprises qualitative and quantitative methods. Among these approaches, probabilistic, heuristic (direct geomorphological mapping or combination of indirect quantitative maps), statistical (two or multivariate statistics) and deterministic approaches are widely used. Cardinali et al. (2002) outlined a m...

Earthquake-induced landslide (EQIL) inventories are essential tools to extend our knowledge of the relationship between earthquakes and the landslides they can trigger. Regrettably, such inventories are difficult to generate and therefore scarce, and the available ones differ in terms of their quality and level of completeness. Moreover, access to...

Mass movements and surface runoff are the main geomorphic processes controlling the erosion in the northern margin of the tectonically active Anatolian Plateau. In general, the northern margin of the plateau is characterized by extreme orographic precipitation and rapid uplifts in terms of climate and tectonics. Very few studies are available on th...

This study presents the first results on analysis of the landslides triggered by the Mw 7.8 Kaikoura earthquake that occurred on November 14, 2016 in the region between the Hikurangi subduction system of the North Island and the oblique collisional regime of the South Island (Alpine Fault). The earthquake ruptured several faults that expand into tw...

This paper presents the results of a geomorphological investigation of Mount Akdag landslide complex, located on the Western Taurus range, SW Turkey. The landslide, resulting in the collapse of a 5 km segment of Mount Akdag, covers an area of 9.8 km 2 and has a volume of about 3 × 108 m 3. The 1:15,000 scale geomorphological map (Main Map) of the A...

In areas where groundwater overexploitation occurs, land subsidence triggered by aquifer compaction is observed, resulting in high socio-economic impacts for the affected communities. In this paper, we focus on the Konya region, one of the leading economic centers in the agricultural and industrial sectors in Turkey. We present a multi-source data...

zet Son derece çizgisel bir vadi olan Kelkit Vadisi'nin güney ve kuzey yamaçları arasında belirgin bir asimetri vardır.Tektonik denetimli vadi ve vadinin yüksek eğimlerle temsil edilen yamaçları geçmişten günümüze kadar yoğun heyelan aktivitesinin gözlendiği bir alan olmuştur. Çok zamanlı heyelan envanteri çalışma sahasında tektonik ve jeomorfoloji...

zet Bu çalışma buzullaşmaya uğramış Akdağ kütlesinin güney yamaçlarında (GB Türkiye), karbonatlı kaya ve filiş birimleri içerisinde gelişmiş son derece aktif bir kompleks heyelan olan Akdağ heyelanına ilişkin jeomorfolojik incelemelerin sonuçlarını içerir. 9,8 km2'lik bir alan kaplayan ve 3×108 m3'lük bir hacme sahip heyelan Akdağ kütlesinin güneyi...

We present a new, seismologically consistent expression for the total area and volume of populations of earthquake-triggered landslides. This model builds on a set of scaling relationships between key parameters, such as landslide spatial density, seismic ground acceleration, fault length, earthquake source depth, and seismic moment. To assess the...

Belirli bir alanda doğal veya antropojenik faktörlerle tetiklenen heyelanların hızlı ve doğru bir şekilde haritalanması hasar tespit ve sonrasındaki ikincil zararları önlemek için önemlidir. Günümüzde, yağış ve deprem gibi doğal tetikleyicilerin şiddetine göre dağılım ve büyüklükleri değişen heyelanlara ilişkin güvenilir envanterlerden bölgede benz...

Earthquakes impart a catastrophic forcing on hillslopes, that often lead to widespread landsliding and can contribute significantly to sedimentary and organic matter fluxes. We present a new expression for the total area and volume of populations of earthquake-induced landslides.This model builds on a set of scaling relationships between key parame...

Kelkit Cayi, Kuzey Anadolu Fayi tarafindan kontrol edilen son derece cizgisel bir vadi sekline sahiptir. Litolojik gecislerin keskin, topografik rolyef ve egimin yuksek oldugu bir sahadir. Calisma alanini olusturan Kelkit Cayi’nin asagi cigiri (Umurca-Koyulhisar arasi) tektonik ve jeomorfolojik sureclere bagli gelisen heyelanlarin yogun oldugu bir...

October 23, 2011 Van earthquake (Mw 7.1) triggered more than 70 landslides, over an area of ~2480 km2. These landslides were mainly consisted of falls and slides, although lateral spreadings also occurred. Among these landslides, a small portion directly affected the structures and the transportation network. The most important permanent damage tha...