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...

The devastating Kahramanmaraş earthquake sequence occurred on February 6, 2023. Two main events, Mw 7.8 and Mw 7.5 occurred nine hours apart, affected 11 cities in Turkey, and subjected an area of ~90,000 km2 to shaking levels known to trigger landslides (peak ground acceleration > 0.08 g). Extensive landsliding was expected given the hilly terrain...

8 Aralık 2024 Güngören, Arhavi (Artvin) Moloz Çığının Oluşum Dinamiği ve Alanın Heyelan Tehlike ve Risk Bakımından Değerlendirmesi December 8, 2024, Güngören, Arhavi (Artvin) Debris Avalanche Dynamics and Landslide Hazard and Risk Assessment of the Area

On February 13, 2024, at 11:28 UTC, a huge, fatal landslide (approximately 6 million m³) struck the Çöpler gold mine in Erzincan, eastern Turkey. This was a flow-type fast landslide (i.e., ~12 m/s) occurred in heap-leaching material resulted in nine miner casualties. Beyond the catastrophic consequences of this event, here we examine the source cha...

The large wildfire sequence took place in July and August 2023 in Çanakkale, recorded as the largest wildfire incident in NW, Türkiye. The total affected area in two successive wildfires is 79.1 km². This study presents an observation-based instance and statistical model findings of how topography as a major determinant controls wildfire propagatio...

An intricate association between weathering and erosional processes is largely controlled by climate disparities. Weathering as a predisposing process for natural hazards, landform evolution, and sediment mobility, hosts key uncertainties in our understanding of how climate controls differential weathering types and rates. Here, we investigate how...

Horizontally sliding sediments are the "mobile structural cells", they create different chronostratigraphic problems such as difficulty of accurate sequence definitions, lack of laminae or accretionary repeated laminae (asymmetrical - symmetrical) due to the inter sediment folds as 'hidden discontinuities' around their bed sediments. The events are...

A destructive landslide occurred in Himmetoğlu village in Göynük District (Bolu, NW Turkey) caused by open-pit coal mining activities. Field observations after the landslide failure and interviews with villagers motivated us to question the possibility of using satellite SAR data to detect precursory signs of failure with regard to deformation velo...

Landslides are a common global geohazard that lead to substantial loss of life and socio-economic damage. Landslides are becoming more common due to extreme weather events and the impacts of anthropogenic disturbance, and thus, they are threatening sustainable development in many vulnerable areas. Previous studies on fatal landslides have focused o...

The Newmark displacement (ND) method, which reproduces the interactions between waves, solids, and fluids during an earthquake, has experienced numerous modifications. We compare the performances of a traditional and a modified version of the ND method through the analysis of co-seismic landslides triggered by the 2022 Ms 6.8 Luding earthquake (Sic...

new insights for considerations of basin evolution with help of sedimentary structures presentation https://www.researchgate.net/publication/370060144_New_Types_of_Experiments_Determining_Tectonic_or_Gravitational_Sediment_Deformations_in_Basin_Evolution_and_Comparisons_from_the_Aegean_Seafloor?_sg%5B0%5D=1N_iite-fyuy0oCs-UGmBVWAuEreDDxi4WpSDBud8E...

Numerical models were used to study gas hydrates and free gas stability over time in gas hydrate-bearing sediments off the Antarctic Peninsula, South Shetland Islands, for the first time. Seismic data aided in creating a marine subsurface model, and ANSYS-Fluent was employed for multiphase simulations. Results revealed that in-situ faults played a...

Landslides are prominent natural events with high destructive power. Since they affect large areas, it is important to monitor the areas they cover and analyse their movement. Remote sensing data and image processing techniques have been used to monitor landslides in different areas. Synthetic aperture radar (SAR) data, particularly with the Interf...

The second-largest valley on Mars is Kasei Valles. This research focuses on the landforms produced by surface processes in the southern branch of Kasei Valles’s midstream. By using cross-cutting relationships, and empirical crater dating of landforms, we constructed a morpho-stratigraphical chronology of the valles. Landforms such as deeply eroded...

The Çukurova Delta Complex, which is located in the south of Turkey along the northeastern corner of the Mediterranean Sea, is the second-largest delta system in the Mediterranean. The Seyhan River flowed 10 km east from its current course until at least the 16 th Century, and shifted to its current course in the west and began to build the modern...

The effect of the North Adrasan, Kumluca wildfire in 2016 on soil element concentrations has been evaluated. Samples were analyzed by neutron activation analysis for As, Ca, Co, Cr, Fe, K, Mg, Mn, Ni, V, and Zn. The main findings of this study were as follows: (1) Co, Cr, Fe, Mg, Mn, Ni, and Zn were higher in burned soils, (2) Cr (up to 9000 mg kg−...

Collecting proofs on sediment deformations for how basin developing , soft sediment deformations and dwell on new possibilities so as not to be narrow-minded. Analogue experiment for soft surface deformations that best models the compression, slide and shear functions in nature. Because the material agglomeration does not consist of linear or parti...

Post-wildfire management actions mainly targeting the removal of salvage logs and burned trees is a common but controversial practice. Although it aims to regain some of the natural and economic value of a forest, it also requires disturbing burned areas, which may have some negative consequences affecting, for instance, the carbon cycle, soil eros...

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...

Landslides are commonly occurring global geological hazards, with negative and far-reaching consequences for human life, and the economic and natural environment. This study analyzes the risk, vulnerability, and resilience of several landslide-prone areas in eight countries based on community perception and attitude related to landslide events thro...

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...

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...

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...

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 archaeological structures buried underground are displayed by utilizing GPR.– Geomorphological units are determined via SVF and RRIM in the GIS environment.– The effects of dry farming, site-tethered pastoralism is discussed by using an ABM.

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...

Unmanned Aerial Vehicles (UAVs), which can carry a variety of payloads, and be operated automatically or manually with ground control stations. Nowadays, UAVs can make photogrammetric flight plans and obtain photogrammetric data with existing sensor systems. Automatic data acquisition processes provide lower cost, and high spatial and temporal reso...

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...