Fault Sources - Revision history

Grichards at 19:06, 17 March 2023

2023-03-17T19:06:49Z

← Older revision		Revision as of 19:06, 17 March 2023
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	* '''Mechanism''': Each fault should have a specified mechanism: normal, reverse (thrust) or strike-slip. Normal and reverse faulting are examples of dip-slip, where the displacement along the fault is in the direction of dip and movement involves a vertical component. Normal faults occur mainly in areas where the crust is being extended such as divergent boundaries. Reverse (thrust) faults occur in areas where the crust is being shortened for example at convergent boundary. Strike-slip faults are normally steep structures where the two sides of the fault slip horizontally past each other; transform boundaries are a particular type of strike-slip fault. Many earthquakes are caused by movement on faults that have components of both dip-slip and strike-slip; this is known as oblique slip.		* '''Mechanism''': Each fault should have a specified mechanism: normal, reverse (thrust) or strike-slip. Normal and reverse faulting are examples of dip-slip, where the displacement along the fault is in the direction of dip and movement involves a vertical component. Normal faults occur mainly in areas where the crust is being extended such as divergent boundaries. Reverse (thrust) faults occur in areas where the crust is being shortened for example at convergent boundary. Strike-slip faults are normally steep structures where the two sides of the fault slip horizontally past each other; transform boundaries are a particular type of strike-slip fault. Many earthquakes are caused by movement on faults that have components of both dip-slip and strike-slip; this is known as oblique slip.
	* '''Magnitude Distribution''': The magnitude distribution is a probability density function (pdf) that describes the relative number of large magnitude, moderate and small magnitude earthquakes that occur on a seismic source. There are two forms of the magnitude density functions that are considered in Probabilistic Seismic Hazard Analysis (PSHA). The functions are a truncated exponential model and the characteristic model. Alternate models are composites of the truncated exponential and the characteristic. This parameter is only required for Probabilistic Seismic Hazard Analysis.		* '''Magnitude Distribution''': The magnitude distribution is a probability density function (pdf) that describes the relative number of large magnitude, moderate and small magnitude earthquakes that occur on a seismic source. There are two forms of the magnitude density functions that are considered in Probabilistic Seismic Hazard Analysis (PSHA). The functions are a truncated exponential model and the characteristic model. Alternate models are composites of the truncated exponential and the characteristic. This parameter is only required for Probabilistic Seismic Hazard Analysis.
	* '''Activity Rate''': There are two common approaches for estimating activity rates on seismic sources: historical [[seismicity]] and geologic information. This parameter is only required for PSHA.		* '''Activity Rate''': There are two common approaches for estimating activity rates on seismic sources: historical seismicity and geologic information. This parameter is only required for PSHA.

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Rmanwaring at 20:52, 20 December 2022

2022-12-20T20:52:31Z

← Older revision		Revision as of 20:52, 20 December 2022
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	* '''Fault Geometry''': The fault geometry includes the coordinates in map view, cross-section (depth), width, and the dip.		* '''Fault Geometry''': The fault geometry includes the coordinates in map view, cross-section (depth), width, and the dip.
	* '''Mechanism''': Each fault should have a specified mechanism: normal, reverse (thrust) or strike-slip. Normal and reverse faulting are examples of dip-slip, where the displacement along the fault is in the direction of dip and movement involves a vertical component. Normal faults occur mainly in areas where the crust is being extended such as divergent boundaries. Reverse (thrust) faults occur in areas where the crust is being shortened for example at convergent boundary. Strike-slip faults are normally steep structures where the two sides of the fault slip horizontally past each other; transform boundaries are a particular type of strike-slip fault. Many earthquakes are caused by movement on faults that have components of both dip-slip and strike-slip; this is known as oblique slip.		* '''Mechanism''': Each fault should have a specified mechanism: normal, reverse (thrust) or strike-slip. Normal and reverse faulting are examples of dip-slip, where the displacement along the fault is in the direction of dip and movement involves a vertical component. Normal faults occur mainly in areas where the crust is being extended such as divergent boundaries. Reverse (thrust) faults occur in areas where the crust is being shortened for example at convergent boundary. Strike-slip faults are normally steep structures where the two sides of the fault slip horizontally past each other; transform boundaries are a particular type of strike-slip fault. Many earthquakes are caused by movement on faults that have components of both dip-slip and strike-slip; this is known as oblique slip.
	* '''Magnitude Distribution''': The magnitude distribution is a probability density function (pdf) that describes the relative number of large magnitude, moderate and small magnitude earthquakes that occur on a seismic source. There are two forms of the magnitude density functions that are considered in PSHA. The functions are a truncated exponential model and the characteristic model. Alternate models are composites of the truncated exponential and the characteristic. This parameter is only required for Probabilistic Seismic Hazard Analysis.		* '''Magnitude Distribution''': The magnitude distribution is a probability density function (pdf) that describes the relative number of large magnitude, moderate and small magnitude earthquakes that occur on a seismic source. There are two forms of the magnitude density functions that are considered in Probabilistic Seismic Hazard Analysis (PSHA). The functions are a truncated exponential model and the characteristic model. Alternate models are composites of the truncated exponential and the characteristic. This parameter is only required for Probabilistic Seismic Hazard Analysis.
	* '''Activity Rate''': There are two common approaches for estimating activity rates on seismic sources: historical [[seismicity]] and geologic information. This parameter is only required for ~~Probabilistic Seismic Hazard Analysis~~.		* '''Activity Rate''': There are two common approaches for estimating activity rates on seismic sources: historical [[seismicity]] and geologic information. This parameter is only required for PSHA.

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Grichards at 23:40, 14 December 2022

2022-12-14T23:40:42Z

← Older revision		Revision as of 23:40, 14 December 2022
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	<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->		<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->
	Fault sources are modeled as multi-planar features with earthquake ruptures distributed over the fault plane. The input parameters required to model a fault in a [[Seismic]] Hazard Analysis (SHA) are as follows:		Fault sources are modeled as multi-planar features with earthquake ruptures distributed over the fault plane. The input parameters required to model a fault in a [[Seismic]] Hazard Analysis (SHA) are as follows:
	* [[Fault Geometry]]		* '''Fault Geometry''': The fault geometry includes the coordinates in map view, cross-section (depth), width, and the dip.
	* [[Mechanism]] (Normal, Reverse, Strike-~~Slip)~~		* '''Mechanism''': Each fault should have a specified mechanism: normal, reverse (thrust) or strike-slip. Normal and reverse faulting are examples of dip-slip, where the displacement along the fault is in the direction of dip and movement involves a vertical component. Normal faults occur mainly in areas where the crust is being extended such as divergent boundaries. Reverse (thrust) faults occur in areas where the crust is being shortened for example at convergent boundary. Strike-slip faults are normally steep structures where the two sides of the fault slip horizontally past each other; transform boundaries are a particular type of strike-slip fault. Many earthquakes are caused by movement on faults that have components of both dip-slip and strike-slip; this is known as oblique slip.
	* [[Magnitude Distribution]] (required for Probabilistic Seismic Hazard Analysis ~~only)~~		* '''Magnitude Distribution''': The magnitude distribution is a probability density function (pdf) that describes the relative number of large magnitude, moderate and small magnitude earthquakes that occur on a seismic source. There are two forms of the magnitude density functions that are considered in PSHA. The functions are a truncated exponential model and the characteristic model. Alternate models are composites of the truncated exponential and the characteristic. This parameter is only required for Probabilistic Seismic Hazard Analysis.
	* [[~~Activity Rate~~]] (required for Probabilistic Seismic Hazard Analysis ~~only)~~		* '''Activity Rate''': There are two common approaches for estimating activity rates on seismic sources: historical [[seismicity]] and geologic information. This parameter is only required for Probabilistic Seismic Hazard Analysis.

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Grichards at 23:34, 14 December 2022

2022-12-14T23:34:17Z

← Older revision		Revision as of 23:34, 14 December 2022
Line 5:		Line 5:
	Fault sources are modeled as multi-planar features with earthquake ruptures distributed over the fault plane. The input parameters required to model a fault in a [[Seismic]] Hazard Analysis (SHA) are as follows:		Fault sources are modeled as multi-planar features with earthquake ruptures distributed over the fault plane. The input parameters required to model a fault in a [[Seismic]] Hazard Analysis (SHA) are as follows:
	* [[Fault Geometry]]		* [[Fault Geometry]]
	* [[Mechanism ~~\| Mechanism~~ (Normal, Reverse, Strike-Slip)]]		* [[Mechanism]] (Normal, Reverse, Strike-Slip)
	* [[Magnitude Distribution ~~\| Magnitude Distribution~~ (required for Probabilistic Seismic Hazard Analysis only)]]		* [[Magnitude Distribution]] (required for Probabilistic Seismic Hazard Analysis only)
	* [[Activity Rate ~~\| Activity Rate~~ (required for Probabilistic Seismic Hazard Analysis only)]]		* [[Activity Rate]] (required for Probabilistic Seismic Hazard Analysis only)

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Grichards at 23:33, 14 December 2022

2022-12-14T23:33:29Z

← Older revision		Revision as of 23:33, 14 December 2022
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	* [[Magnitude Distribution \| Magnitude Distribution (required for Probabilistic Seismic Hazard Analysis only)]]		* [[Magnitude Distribution \| Magnitude Distribution (required for Probabilistic Seismic Hazard Analysis only)]]
	* [[Activity Rate \| Activity Rate (required for Probabilistic Seismic Hazard Analysis only)]]		* [[Activity Rate \| Activity Rate (required for Probabilistic Seismic Hazard Analysis only)]]

	~~==Examples==~~
	~~{{Website Icon}}~~

	~~==Best Practices Resources==~~
	~~{{Document Icon}}~~

	~~==Trainings==~~
	~~{{Video Icon}}~~

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Grichards at 05:45, 18 November 2022

2022-11-18T05:45:48Z

← Older revision		Revision as of 05:45, 18 November 2022
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	__NOTOC__		__NOTOC__
			[[Category:Seismic Source Characterization]]
	----		----
	<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->		<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->
	Fault sources are modeled as multi-planar features with earthquake ruptures distributed over the fault plane. The input parameters required to model a fault in a Seismic Hazard Analysis (SHA) are as follows:		Fault sources are modeled as multi-planar features with earthquake ruptures distributed over the fault plane. The input parameters required to model a fault in a [[Seismic]] Hazard Analysis (SHA) are as follows:
	* [[Fault Geometry]]		* [[Fault Geometry]]
	* [[Mechanism \| Mechanism (Normal, Reverse, Strike-Slip)]]		* [[Mechanism \| Mechanism (Normal, Reverse, Strike-Slip)]]

Rmanwaring at 22:34, 30 September 2022

2022-09-30T22:34:02Z

@@ Line 7: / Line 7: @@
 * [[Magnitude Distribution | Magnitude Distribution (required for Probabilistic Seismic Hazard Analysis only)]]
 * [[Activity Rate | Activity Rate (required for Probabilistic Seismic Hazard Analysis only)]]
 ==Examples==

Rmanwaring at 22:31, 30 September 2022

2022-09-30T22:31:31Z

← Older revision		Revision as of 22:31, 30 September 2022
Line 3:		Line 3:
	<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->		<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->
	Fault sources are modeled as multi-planar features with earthquake ruptures distributed over the fault plane. The input parameters required to model a fault in a Seismic Hazard Analysis (SHA) are as follows:		Fault sources are modeled as multi-planar features with earthquake ruptures distributed over the fault plane. The input parameters required to model a fault in a Seismic Hazard Analysis (SHA) are as follows:
	* Fault Geometry		* [[Fault Geometry]]
	** Coordinates in Map View		* [[Mechanism \| Mechanism (Normal, Reverse, Strike-Slip)]]
	** Cross-Section (Depth)		* [[Magnitude Distribution \| Magnitude Distribution (required for Probabilistic Seismic Hazard Analysis only)]]
	** Width		* [[Activity Rate \| Activity Rate (required for Probabilistic Seismic Hazard Analysis only)]]
	** Dip
	* Mechanism (Normal, Reverse, Strike-Slip)
	* Magnitude Distribution (required for Probabilistic Seismic Hazard Analysis ~~(PSHA)~~ only)
	* Activity Rate (required for ~~PSHA~~ only)

	==Fault Geometry==		==Fault Geometry==

Rmanwaring: Created page with "NOTOC ---- Fault sources are modeled as multi-planar features with earthquake ruptures distributed over the fault plane. The input parameters required to model a fault in a Seismic Hazard Analysis (SHA) are as follows: * Fault Geometry Coordinates in Map View Cross-Section (Depth) Width Dip * Mechanism (Normal, Reverse, Strike-Slip) * Magnitude Distribution..."

2022-09-30T22:29:11Z

Created page with "__NOTOC__ ----  Fault sources are modeled as multi-planar features with earthquake ruptures distributed over the fault plane. The input parameters required to model a fault in a Seismic Hazard Analysis (SHA) are as follows: * Fault Geometry ** Coordinates in Map View ** Cross-Section (Depth) ** Width ** Dip * Mechanism (Normal, Reverse, Strike-Slip) * Magnitude Distribution..."

New page

__NOTOC__
----

Fault sources are modeled as multi-planar features with earthquake ruptures distributed over the fault plane. The input parameters required to model a fault in a Seismic Hazard Analysis (SHA) are as follows:
* Fault Geometry
** Coordinates in Map View
** Cross-Section (Depth)
** Width
** Dip
* Mechanism (Normal, Reverse, Strike-Slip)
* Magnitude Distribution (required for Probabilistic Seismic Hazard Analysis (PSHA) only)
* Activity Rate (required for PSHA only)

==Fault Geometry==

The fault geometry includes the coordinates in map view, cross-section (depth), width, and the dip.

==Mechanism==

Each fault should have a specified mechanism: normal, reverse (thrust) or strike-slip. Normal and reverse faulting are examples of dip-slip, where the displacement along the fault is in the direction of dip and movement involves a vertical component. Normal faults occur mainly in areas where the crust is being extended such as divergent boundaries. Reverse (thrust) faults occur in areas where the crust is being shortened for example at convergent boundary. Strike-slip faults are normally steep structures where the two sides of the fault slip horizontally past each other; transform boundaries are a particular type of strike-slip fault. Many earthquakes are caused by movement on faults that have components of both dip-slip and strike-slip; this is known as oblique slip.

==Magnitude Distributions==

The magnitude distribution is a probability density function (pdf) that describes the relative number of large magnitude, moderate and small magnitude earthquakes that occur on a seismic source. There are two forms of the magnitude density functions that are considered in PSHA. The functions are a truncated exponential model and the characteristic model. Alternate models are composites of the truncated exponential and the characteristic. One important calculation for the magnitude distributions is the characteristic magnitude.

Crustal faults are normally modeled as both characteristic and truncated exponential; characteristic events are normally assigned a probability of 0.7 and the exponential model a probability of 0.3. The weighting is set as such to balance out the two different models. The truncated exponential distribution predicts a higher ratio of lower magnitudes to higher magnitudes than is observed on a single fault. In contrast, the characteristic model, in its most simple application, predicts fewer earthquakes on a fault as compared to the exponential model.

==Characteristic Magnitude==

Estimation of the characteristic magnitude is usually computed based on the fault dimensions (length or area). The mean characteristic magnitude is estimated using the source scaling relations for either the fault length or fault area.

==Activity Rate==

There are two common approaches for estimating activity rates on seismic sources: historical seismicity and geologic information.

==Examples==
{{Website Icon}}

==Best Practices Resources==
{{Document Icon}}

==Trainings==
{{Video Icon}}


{{Citations}}


{{revhistinf}}