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Magnitude-frequency of sea cliff instabilities
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| Zeitschriftentitel: | Natural Hazards and Earth System Sciences |
|---|---|
| Personen und Körperschaften: | |
| In: | Natural Hazards and Earth System Sciences, 8, 2008, 5, S. 1161-1171 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Copernicus GmbH
|
| Schlagwörter: |
| author_facet |
Marques, F. M. S. F. Marques, F. M. S. F. |
|---|---|
| author |
Marques, F. M. S. F. |
| spellingShingle |
Marques, F. M. S. F. Natural Hazards and Earth System Sciences Magnitude-frequency of sea cliff instabilities General Earth and Planetary Sciences |
| author_sort |
marques, f. m. s. f. |
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Marques, F. M. S. F. 1684-9981 Copernicus GmbH General Earth and Planetary Sciences http://dx.doi.org/10.5194/nhess-8-1161-2008 <jats:p>Abstract. The magnitude-frequency relationship of sea cliff failures in strong, low retreat rate cliffs, was studied using systematic historical inventories carried out in the coasts of Portugal and Morocco, in different geological and geomorphological settings, covering a wide size scale, from small to comparatively large rockslides, topples and rockfalls, at different time and spatial scales. The magnitude-frequency expressed in terms of volume displaced and of horizontal area lost at the cliff top showed good fit by inverse power laws of the type p=a.x−b, with a values from 0.2 to 0.3, and exponents b close to 1.0, similar to those proposed for rockfall inventories. The proposed power laws address the magnitude-frequency for sea cliff failures, which is an important component of hazard assessment, to be completed with adequate models for space and time hazard components. Maximum local retreat at the cliff top provided acceptable fitting to inverse power laws only for failures wider than 2m, with a = 4.0, and exponent b = 2.3, which may be useful to assess the cliff retreat hazard for the use of areas located near the cliff top. </jats:p> Magnitude-frequency of sea cliff instabilities Natural Hazards and Earth System Sciences |
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Magnitude-frequency of sea cliff instabilities |
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Magnitude-frequency of sea cliff instabilities |
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Magnitude-frequency of sea cliff instabilities |
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Magnitude-frequency of sea cliff instabilities |
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Magnitude-frequency of sea cliff instabilities |
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Magnitude-frequency of sea cliff instabilities |
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magnitude-frequency of sea cliff instabilities |
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General Earth and Planetary Sciences |
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http://dx.doi.org/10.5194/nhess-8-1161-2008 |
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2008 |
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1161-1171 |
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<jats:p>Abstract. The magnitude-frequency relationship of sea cliff failures in strong, low retreat rate cliffs, was studied using systematic historical inventories carried out in the coasts of Portugal and Morocco, in different geological and geomorphological settings, covering a wide size scale, from small to comparatively large rockslides, topples and rockfalls, at different time and spatial scales. The magnitude-frequency expressed in terms of volume displaced and of horizontal area lost at the cliff top showed good fit by inverse power laws of the type p=a.x−b, with a values from 0.2 to 0.3, and exponents b close to 1.0, similar to those proposed for rockfall inventories. The proposed power laws address the magnitude-frequency for sea cliff failures, which is an important component of hazard assessment, to be completed with adequate models for space and time hazard components. Maximum local retreat at the cliff top provided acceptable fitting to inverse power laws only for failures wider than 2m, with a = 4.0, and exponent b = 2.3, which may be useful to assess the cliff retreat hazard for the use of areas located near the cliff top.
</jats:p> |
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| description | <jats:p>Abstract. The magnitude-frequency relationship of sea cliff failures in strong, low retreat rate cliffs, was studied using systematic historical inventories carried out in the coasts of Portugal and Morocco, in different geological and geomorphological settings, covering a wide size scale, from small to comparatively large rockslides, topples and rockfalls, at different time and spatial scales. The magnitude-frequency expressed in terms of volume displaced and of horizontal area lost at the cliff top showed good fit by inverse power laws of the type p=a.x−b, with a values from 0.2 to 0.3, and exponents b close to 1.0, similar to those proposed for rockfall inventories. The proposed power laws address the magnitude-frequency for sea cliff failures, which is an important component of hazard assessment, to be completed with adequate models for space and time hazard components. Maximum local retreat at the cliff top provided acceptable fitting to inverse power laws only for failures wider than 2m, with a = 4.0, and exponent b = 2.3, which may be useful to assess the cliff retreat hazard for the use of areas located near the cliff top. </jats:p> |
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| spelling | Marques, F. M. S. F. 1684-9981 Copernicus GmbH General Earth and Planetary Sciences http://dx.doi.org/10.5194/nhess-8-1161-2008 <jats:p>Abstract. The magnitude-frequency relationship of sea cliff failures in strong, low retreat rate cliffs, was studied using systematic historical inventories carried out in the coasts of Portugal and Morocco, in different geological and geomorphological settings, covering a wide size scale, from small to comparatively large rockslides, topples and rockfalls, at different time and spatial scales. The magnitude-frequency expressed in terms of volume displaced and of horizontal area lost at the cliff top showed good fit by inverse power laws of the type p=a.x−b, with a values from 0.2 to 0.3, and exponents b close to 1.0, similar to those proposed for rockfall inventories. The proposed power laws address the magnitude-frequency for sea cliff failures, which is an important component of hazard assessment, to be completed with adequate models for space and time hazard components. Maximum local retreat at the cliff top provided acceptable fitting to inverse power laws only for failures wider than 2m, with a = 4.0, and exponent b = 2.3, which may be useful to assess the cliff retreat hazard for the use of areas located near the cliff top. </jats:p> Magnitude-frequency of sea cliff instabilities Natural Hazards and Earth System Sciences |
| spellingShingle | Marques, F. M. S. F., Natural Hazards and Earth System Sciences, Magnitude-frequency of sea cliff instabilities, General Earth and Planetary Sciences |
| title | Magnitude-frequency of sea cliff instabilities |
| title_full | Magnitude-frequency of sea cliff instabilities |
| title_fullStr | Magnitude-frequency of sea cliff instabilities |
| title_full_unstemmed | Magnitude-frequency of sea cliff instabilities |
| title_short | Magnitude-frequency of sea cliff instabilities |
| title_sort | magnitude-frequency of sea cliff instabilities |
| title_unstemmed | Magnitude-frequency of sea cliff instabilities |
| topic | General Earth and Planetary Sciences |
| url | http://dx.doi.org/10.5194/nhess-8-1161-2008 |