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The tectonically driven growth of mountains reflects the characteristics of the underlying fault systems and the applied tectonic forces. Over time, fault networks might be relatively static, but stress conditions could change and result in variations in fault slip orientation. Such a tectonic landscape would transition from a simple to a composite state: the topography of simple landscapes is correlated with a single set of tectonic boundary conditions, while composite landscapes contain inherited topography due to earlier deformation under different boundary conditions. We use fault interaction modeling to compare vertical displacement fields with topographic metrics to differentiate the two types of landscapes. By successively rotating the axis of maximum horizontal stress, we produce a suite of vertical displacement fields for comparison with real landscapes. We apply this model to a transpressional duplex in the south central Alborz Mountains of Iran, where NW oriented compression was superseded by neotectonic NE compression. The consistency between the modeled displacement field and real landforms indicates that the duplex topography is mostly compatible with the modern boundary conditions, but might include a small remnant from the earlier deformation phase. Our approach is applicable for various tectonic settings and represents an approach to identify the changing boundary conditions that produce composite landscapes. It may be particularly useful for identifying changes that occurred in regions where river profiles may no longer record a signal of the change or where the spatial pattern of uplift is complex.
Aufgrund seines umstrittenen Atomprogramms ist der Iran ein Dauerbrenner in den Medien. Doch nicht nur deshalb sollte das Land Beachtung finden. Ahmad Naderi gewährt uns einen Blick auf die Geopolitik des Iran, der besonders für die in vielen arabischen Staaten unterdrückten Schiiten Orientierungspunkt sein will. Doch strebt das Land die Hegemonie in der Region an? Johannes Reissner (1949-2009) analysiert das Selbstverständnis des Iran und seine Verhaltensmuster. Sollte der Westen seine Politik überdenken?
Es brodelt in Iran, und das gewaltig! Doch nicht die Straße ist der Ort des Geschehens. Im Schatten der Berichterstattung über die arabischen Rebellionen vom Maghreb bis zum Golf wütet in der Islamischen Republik ein Kampf der Eliten. Diese haben sich im Zuge der grünen Bewegung Teile ihrer Körperschaft entledigt. Grün ist verwelkt; heute tobt ein neuer Machtkampf. Die neue Herausforderung kommt von unerwarteter Seite: aus den innersten Kreisen des Systems selbst. Unliebsam sind nunmehr alte Pfeiler des Regimes: Rafsanjani, Mashāi, aber allen voran Mahmoud Ahmadinejad!
Das Paper untersucht die geopolitische Konfrontation zwischen Iran und den USA sowie deren Auswirkung auf eine Veränderung der bestehenden Weltordnung. Es wird deutlich, dass die US-amerikanische Sanktionspolitik nicht nur auf das Nuklearprogramm abzielt, sondern grundsätzlich versucht, die Wirtschaftskraft der unabhängig von den Interessen der USA agierenden Regionalmacht zu brechen. Doch die Sanktionspolitik konnte weder eine Lösung des Nukleardossiers herbeiführen noch die Wirtschaftskraft Irans eindämmen. Es ist Zeit für eine fundamentale Kursänderung.
Im Zentrum steht die Genese einer sich im 20. Jahrhundert zunehmend ideologisierenden Schia, deren wachsende diskursive Macht sich mit der Iranischen Revolution von 1979 durch die Schaffung realpolitischer Strukturen in Form der velayāt-e faqih niederzuschlagen vermag. Untersucht wird, unter welchen Bedingungen der gesellschaftspolitische Entwurf des schiitischen Klerus sich auch im Hinblick auf existierende nicht-religiöse Gegendiskurse seiner Zeit – etwa aus der staatlichen Bürokratie, Intellektuellenzirkeln oder aus linken und nationalen Bewegungen – wandelte. Wie begegnete der Klerus den drängenden gesellschaftlichen Fragen der Moderne und wie wird der politische Diskurs heute geführt?
The seismically active Alborz mountains of northern Iran are an integral part of the Arabia-Eurasia collision. Linked strike-slip and thrust/reverse-fault systems in this mountain belt are characterized by slow loading rates, and large earthquakes are highly disparate in space and time. Similar to other intracontinental deformation zones such a pattern of tectonic activity is still insufficiently understood, because recurrence intervals between seismic events may be on the order of thousands of years, and are thus beyond the resolution of short term measurements based on GPS or instrumentally recorded seismicity. This study bridges the gap of deformation processes on different time scales. In particular, my investigation focuses on deformation on the Quaternary time scale, beyond present-day deformation rates, and it uses present-day and paleotectonic characteristics to model fault behavior. The study includes data based on structural and geomorphic mapping, faultkinematic analysis, DEM-based morphometry, and numerical fault-interaction modeling. In order to better understand the long- to short term behavior of such complex fault systems, I used geomorphic surfaces as strain markers and dated fluvial and alluvial surfaces using terrestrial cosmogenic nuclides (TCN, 10Be, 26Al, 36Cl) and optically stimulated luminescence (OSL). My investigation focuses on the seismically active Mosha-Fasham fault (MFF) and the seismically virtually inactive North Tehran Thrust (NTT), adjacent to the Tehran metropolitan area. Fault-kinematic data reveal an early mechanical linkage of the NTT and MFF during an earlier dextral transpressional stage, when the shortening direction was oriented northwest. This regime was superseded by Pliocene to Recent NE-oriented shortening, which caused thrusting and sinistral strike-slip faulting. In the course of this kinematic changeover, the NTT and MFF were reactivated and incorporated into a nascent transpressional duplex, which has significantly affected landscape evolution in this part of the range. Two of three distinctive features which characterize topography and relief in the study area can be directly related to their location inside the duplex array and are thus linked to interaction between eastern MFF and NTT, and between western MFF and Taleghan fault, respectively. To account for inferred inherited topography from the previous dextral-transpression regime, a new concept of tectonic landscape characterization has been used. Accordingly, I define simple landscapes as those environments, which have developed during the influence of a sustained tectonic regime. In contrast, composite landscapes contain topographic elements inherited from previous tectonic conditions that are inconsistent with the regional present-day stress field and kinematic style. Using numerical fault-interaction modeling with different tectonic boundary conditions, I calculated synoptic snapshots of artificial topography to compare it with the real topographic metrics. However, in the Alborz mountains, E-W faults are favorably oriented to accommodate the entire range of NW- to NE-directed compression. These faults show the highest total displacement which might indicate sustained faulting under changing boundary conditions. In contrast to the fault system within and at the flanks of the Alborz mountains, Quaternary deformation in the adjacent Tehran plain is characterized by oblique motion and thrust and strike-slip fault systems. In this morphotectonic province fault-propagation folding along major faults, limited strike-slip motion, and en-échelon arrays of second-order upper plate thrusts are typical. While the Tehran plain is characterized by young deformation phenomena, the majority of faulting took place in the early stages of the Quaternary and during late Pliocene time. TCN-dating, which was performed for the first time on geomorphic surfaces in the Tehran plain, revealed that the oldest two phases of alluviation (units A and B) must be older than late Pleistocene. While urban development in Tehran increasingly covers and obliterates the active fault traces, the present-day kinematic style, the vestiges of formerly undeformed Quaternary landforms, and paleo earthquake indicators from the last millennia attest to the threat that these faults and their related structures pose for the megacity.
Das politische System Irans
(2009)
Seit nunmehr 30 Jahren hat die Islamische Republik Iran Bestand, doch noch immer dauern Debatten über die Einordnung des politischen Systems an. Handelt es sich um ein autoritäres oder totalitäres Regime oder gar um eine neue Form islamischer Herrschaft? Die Beantwortung der Frage ist nicht nur für die Wissenschaft von Relevanz; sie ist von hoher politischer Aktualität. In zehn Beiträgen von deutschen und iranischen Autoren wird das politische System der Islamischen Republik anhand seiner Geschichte, seines Institutionengefüges, seiner gesellschaftlichen Kräfte sowie seiner Außenbeziehungen analysiert und in das regionale Gefüge eingeordnet. Ergänzt werden die Artikel durch Schaubilder und Statistiken sowie durch eine Zeittafel und ein Glossar mit den wichtigsten Begrifflichkeiten.