Assessment of the Nature, Distribution and Causes of Land Subsidence in Central and Northern Saudi Arabia

Abdullah Othman1, Mohamed Sultan2, Hassan Al Harbi3, Ahmed Youssef3, Mohamed Ahmed4,5, Mustafa Kemal Emil2, Yesser Zabramwi3, Saeed Alzahrani3, Alla Bahamil6 and Kyle Chouinard7, (1)Western Michigan University, Geosciences, Kalamazoo, United States, (2)Western Michigan University, Department of Geological and Environmental Sciences, Kalamazoo, MI, United States, (3)SAUDI GEOLOGICAL SURVAY, Jeddah, Saudi Arabia, (4)Texas A&M University- Corpus Christi, Department of Physical and Environmental Sciences, Corpus Christi, United States, (5)Suez Canal University, Faculty of Science, Geology Department, Ismailia, Egypt, (6)Saudi Geological Survey, Jeddah, Saudi Arabia, (7)Western Michigan University, Kalamazoo, MI, United States
Abstract:
Numerous land subsidence events have been recently reported from central and northern parts of the Kingdom of Saudi Arabia in Hail, Al Qassim, Al Jowf, and Buraydah Provinces. In some cases, these incidences resulted in losses in life and property. In this study, an integrated (field, geologic, remote sensing) approach is applied to accomplish the following: (1) identify the spatial distribution and extent of areas affected by subsidence (TASK I), (2) identify the factor(s) causing such subsidence (TASK II), and (3) identify areas threatened by such phenomena across northern and central parts of the Kingdom using criteria extracted from TASK II (TASK III). A three-fold approach was applied: (1) visits were conducted to collect field observations from reported subsidence locations, (2) spatial correlations were implemented in a web-based GIS environment for the reported subsidence locations in relation to relevant co-registered static datasets (e.g., rock and soil types, geologic structures) and temporal datasets (e.g., groundwater extraction, landuse/landcover, distribution and magnitude of earthquakes), (3) subsidence rates were extracted applying the Small BAseline Subset (SBAS) radar interferometric technique and using European Remote Sensing satellite-1 (ERS-1), ERS-2, and the Environmental Satellite (Envisat) data sets. Our findings (from radar interferometric studies) indicate that the distribution of areas undergoing subsidence are consistent/correlate with: (1) reported subsidence locations, but reveal many additional unreported subsidence locations, (2) irrigated lands, especially those witnessing a progressive increase in agricultural activities with time; (3) outcrops of the Saq sandstone aquifer system, the main source for fresh groundwater in the Kingdom, (4) outcrops the Minjur limestone formation that are subject to karstification; and (5) urban centers lacking appropriate sewage and drainage systems.
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