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| Kazerun Fault | |
|---|---|
| Name | Kazerun Fault |
| Location | Fars Province, Iran |
| Type | Strike-slip fault |
| Length | ~80–200 km |
| Status | Active |
| Displacement | ~mm–cm/yr |
Kazerun Fault The Kazerun Fault is an active strike-slip fault system in Fars Province, Iran, associated with repeated damaging earthquakes and complex crustal deformation. It trends NW–SE and crosses or approaches populated places, transportation corridors, and cultural sites, making it a focus of seismic hazard studies by Iranian and international researchers. The fault interacts with major tectonic structures and forms part of the deformation fabric of the Zagros orogen and adjacent plate boundary systems.
The Kazerun Fault lies within southwestern Iran near Shiraz, Bushehr Province, and the city of Kazerun and has been characterized through surface mapping, remote sensing, and paleoseismology by teams from institutions such as the University of Tehran and the Iranian Seismological Center. Regional studies reference comparisons with the Main Recent Fault, the Zagros fold and thrust belt, and the sanandaj-sirjan zone. Its segments have been mapped alongside infrastructure features such as the Persian Gulf pipelines and the Shiraz International Airport access roads, and it has implications for heritage sites linked to Persepolis and historic trade routes.
Geologically, the fault cuts Neogene to Quaternary sedimentary sequences that overlie the crystalline units of the Zagros Mountains and the Sanandaj-Sirjan Zone. Structural analysis documents right-lateral strike-slip motion with local normal and reverse components, connecting with fault splays near the Bushehr Basin and transferring strain toward the Makran Trench and the Alborz Mountains via transfer zones identified in regional cartography. Remote sensing by Landsat, Sentinel-1, and field mapping near Kuh-e Rud reveal linear valleys, sag ponds, and scarps, while borehole data from energy companies operating in the Persian Gulf provide subsurface constraints on displacement and lithology.
Instrumental seismicity recorded by the International Seismological Centre and the Global Seismographic Network shows clusters of events along the fault, and historical catalogs compiled by the Iranian Seismological Center and the United States Geological Survey document damaging earthquakes attributed to nearby structures. Paleoseismic trenches excavated across fault strands near populated villages reveal multiple earthquake horizons dated with radiocarbon dating and optically stimulated luminescence, indicating late Holocene recurrence intervals that have been used to estimate slip rates. Notable regional earthquakes that inform Kazerun Fault studies include events in the broader Fars Province and adjacent zones historically recorded in chronicles tied to Safavid Iran and Qajar Iran.
The Kazerun Fault resides within the deforming zone between the convergent boundary of the Arabian Plate and the Eurasian Plate, contributing to strain partitioning across the Zagros orogeny. Its kinematics are linked to the northward motion of the Arabian Plate measured by GPS campaigns conducted by teams from the Institute of Geophysics, University of Tehran and international collaborators from institutions such as Caltech and ETH Zurich. Interaction with the oblique convergence system connects to the Makran subduction zone, the Main Recent Fault system, and the broader Alpine–Himalayan orogenic belt recognized in tectonic syntheses by the Geological Society of America.
Seismic hazard models that incorporate slip rate estimates, paleoseismic recurrence, and site amplification use inputs from the Iranian Seismological Center, the USGS hazard maps, and regional building-code authorities including standards influenced by the International Building Code. Monitoring relies on seismic stations arrayed by national networks and temporary deployments supported by international projects from agencies such as the National Science Foundation and the European Space Agency using interferometric synthetic aperture radar (InSAR). Hazard assessment emphasizes lifelines such as the Iran National Gas Company pipelines, the Tehran–Bushehr road network, and water-supply infrastructure serving Shiraz University campuses and regional hospitals.
Research initiatives include geological mapping by the Geological Survey of Iran, paleoseismic trenching undertaken by collaborative teams from the University of Tehran and foreign universities, and geodetic time-series analyses published in journals affiliated with the American Geophysical Union and the European Geosciences Union. Studies employ methods spanning structural geology, seismotectonics, InSAR, and paleoseismology to resolve segmentation, slip rates, and earthquake histories, with datasets archived in repositories linked to the International Seismological Centre and university data portals.
The proximity of fault strands to urban centers such as Kazerun and Shiraz places populations, historical monuments, and industrial assets at risk, including petrochemical complexes near Bushehr and transport corridors connecting to the Persian Gulf ports. Emergency response planning involves provincial authorities, municipal services, and national agencies historically activated during earthquakes affecting Fars Province and coordinated with nongovernmental organizations such as the Iranian Red Crescent Society. Mitigation measures promoted by academic and government collaborations include retrofitting critical facilities at Shiraz Nemazee Hospital and enforcing seismic-resistant design practices for schools and heritage conservation near sites related to Achaemenid Empire archaeology.
Category:Geology of Iran Category:Seismic faults