| 000 -LEADER |
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| fixed length control field |
01464pab a2200217 454500 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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| fixed length control field |
180718b1997 xxu||||| |||| 00| 0 eng d |
| 100 ## - MAIN ENTRY--PERSONAL NAME |
|---|
| Personal name |
Amin, Ammar |
| 245 ## - TITLE STATEMENT |
|---|
| Title |
Causes of land subsidence in the Kingdom of Saudi Arabia |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. |
|---|
| Date of publication, distribution, etc. |
1997 |
| 300 ## - PHYSICAL DESCRIPTION |
|---|
| Extent |
p.57-63 |
| 362 ## - DATES OF PUBLICATION AND/OR SEQUENTIAL DESIGNATION |
|---|
| Dates of publication and/or sequential designation |
July |
| 520 ## - SUMMARY, ETC. |
|---|
| Summary, etc. |
The occurrence of land subsidence in the Kingdom Saudi Arabia is either natural or man-made. Natural land subsidence occurs due to the development of subterranean voids by a solution of host rocks in carbonate and evaporite terrains, over many areas of Saudi Arabia. Man-induced land subsidence is either due to the removal of groundwater in the agricultural areas or to wetting of unstable soils. Therefore, earth fissures and a lowering of the ground surface in unconsolidated sediments took place in alluvial plains and volcanic vent terrains. Unstable soils include Sabkha soils and loess sediments. These types of soils occur in coastal plains, desert areas and volcanic terrains. When this soil is wetted either during agricultural activities, waste disposal or even during a rain storm, subsidence takes place due to either the removal of salts from the Sabkha soil or the rearrangement of soil particles in loess sediments. - Reproduced |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
Sabkha soil |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
Loess sediments |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
Salt diapers |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
Karst |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
Land subsidence |
| 700 ## - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Bankher, Khalid |
| 773 ## - HOST ITEM ENTRY |
|---|
| Main entry heading |
Natural Hazards |
| 909 ## - |
|---|
| -- |
40458 |
