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hazard_rt3 [2016/03/24 16:56]
Julio Garcia [Spatial distribution of earthquakes with magnitudes larger than Mw 4.5]
hazard_rt3 [2016/08/12 12:48] (current)
Julio Garcia
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-| {{:​hazard:​rt3_epi_sub_map.png?​650x650&​direct}} ​ | The subduction along the Pacific coast of South America dominates the geodynamics of the whole South American continent, generating the vast       ​majority of the earthquake activity in the region and some of the most powerful earthquakes ever reported (Concepción,​ 1835; Valdivia, 1960; Maule, 2010). ​ |+| {{:​hazard:​rt3_epi_sub_map.png?​1500x1500&​direct}} ​ |The South American region has a wide history of large and destructive earthquakes specially along the West Coast, where the largest earthquake recorded (1960 Mw9.6, Valdivia, Chile) took place. ​                                                                                                                                                                                              The subduction along the Pacific coast of South America dominates the geodynamics of the whole South American continent, generating the vast majority of the earthquake activity in the region and some of the most powerful earthquakes ever reported (Concepción,​ 1835; Valdivia, 1960; Maule, 2010).| ​ 
  
 +===== Methodology =====
 +Two research groups investigated subduction sources within the SARA project focusing on collecting essential ​ information for the characterization of the subduction process and its inclusion into a Probabilistic Seismic Hazard Analysis (PSHA) input model.\\
 +The first research group, led by scientists from Colombia([[http://​www.univalle.edu.co/​|Universidad del Valle]] and [[http://​unal.edu.co/​|Universidad Nacional de Colombia]]),​ prepared an extensive dataset of seismotectonic information related to subduction earthquakes including historical and instrumental seismicity and catalogues of focal mechanisms (Salcedo-Hurtado et al.[2015a]). In addition, a critical review of segmentation models previously appearing in the scientific literature was made and the group proposed a zonation of the main subduction sources affecting South America (Salcedo-Hurtado et al.[2015b], see figures below).
  
 +| {{:​hazard:​rt3_t3_zonation.png?​340| Zonation}} ​ | {{ :​hazard:​rt3_bk_16.png?​275| S.16:  a) Histogram of events, b) Horizontal Velocity of STD, c) Cross section of seismicity}} ​ |
 +| :::                                            | {{ :​hazard:​rt3_bk_20.png?​275| S20:  a) Histogram of events, b) Horizontal Velocity of STD, c) Cross section of seismicity}} ​  |
  
 +The second research group focused specifically on the characterization of the South American subduction zones for PSHA. This characterization was built around the work of a PhD student ([[http://​www.umeschool.it/​|UME School]]) within the GEM Secretariat developing reproducible,​ data-driven methodologies,​ in order to define the subduction zone geometry, segmentation and earthquake activity rates which can be applied in other subduction regions throughout the world (see figures and table below).
  
 +^ Geometry definition ​                                                  ^ Interface model                                                                                                          ^ In-slab model                                                     ^
 +| {{:​hazard:​rt3_luis_geom.png?​675| Interface geometry definition}} ​     | {{ :​hazard:​rt3_luis_seg_inter.png?​450|Interface segmented model}} ​                                                       | {{:​hazard:​rt3_luis_seg_inslab.png?​450 |In-slab segmented model}} ​ |
 +| {{:​hazard:​rt3_luis_3dgeom_slab.png?​700|In-Slab geometry definition}} ​ | **Characterisation of the sources and segmentation** ​ {{ :​hazard:​rt3_luis_geom_table.png?​500 | Geometry segmentation }}                                                                     ||
  
-Spatial distribution of earthquakes with magnitudes larger than Mw 4.5 from the SARA catalogue. Only the events used for the characterisation of the sources are shown, see text for details.+===== Main Results achieved within RT3  =====
  
-===== Methodology ===== +A first model for the subduction ​earthquake ​sources ​based on seismological and geophysical ​information ​was created, combining large fault sources ​for modelling ​the subduction ​interface ​and 3D volumes ​of ruptures describing the spatial distribution ​of in-slab seismicity.
-Two research groups investigated ​subduction sources ​within the SARA project focusing ​on collecting ​information ​essential ​for the characterization of the subduction ​process ​and its inclusion into a Probabilistic Seismic Hazard Analysis (PSHA) input model. +
-|{{:​hazard:​rt3_epi_map.png?​direct200}} |  The first research group, led by scientists from        Colombia([[http://​www.univalle.edu.co/​|Universidad del Valle]] and [[http://​unal.edu.co/​|Universidad Nacional de Colombia]]),​ prepared an extensive dataset ​of seismotectonic information relating to subduction earthquakes including historical and instrumental seismicity, catalogues of focal mechanisms (Salcedo-Hurtado et al.[2015a]),​ a critical review ​of segmentation models previously appearing ​in the scientific literature and proposed a zonation of the main subduction sources affecting South America (Salcedo-Hurtado et al.[2015b])|+
  
 +===== References =====
 +  * International Seismological Center (ISC). 2010. Online Bulletin. [[http://​www.isc.ac.uk/​iscbulletin/​.r.|ISC]] Thatcham, UK. Vol. 4 Issue 1-6.\\
 +  * Rodriguez-Abreu L. E.  Characterization of subduction source models for probabilistic seismic hazard analysis (PSHA). Thesis Submitted in Partial Fulfilment of the Requirements for the Degree of Doctor of Philosophy in Engineering Seismology, UME-School, Pavia, Italy, 2016.\\
 +  * Salcedo Hurtado Elkin De J., Vargas C. A.  and Triviño M. Report of the focal mechanism database. Topic 3: Modelling the subduction process along the western coast and creation of a source model to be used for hazard calculations. GEM SARA Internal Report, Fundacion Universidad del Valle, 2015a.\\
 +  * Salcedo Hurtado Elkin De J., Vargas C. A.  and Triviño M. Modeling the subduction process along the western coast and creation of a source model to be used for hazard calculations. Topic 3: Modelling the subduction process along the western coast and creation of a source model to be used for hazard calculations. GEM Technical report, Fundacion Universidad del Valle, 2015b. Progress Report, March 2015b.
  
 +===== Download The SARA Subduction Zoning DATA-SET ​ =====
  
 +The SARA Subduction Zoning DATA-SET can be downloaded at the link provided below - Please read the license and disclaimer attached. ​
  
 +[[http://​ftp.openquake.org/​data/​sara/​hazard/​t3/​T3_SARA_DATASET.zip| Download]]
  
  
-===== References ===== +[[hazard ​Back to the SARA Hazard main page]] - [[start| Back to the SARA Project main page]]
-International Seismological Center (ISC). 2010. Online Bulletin. ​[[http://​www.isc.ac.uk/​iscbulletin/​.r.|ISC]] Thatcham, UK. Vol. 4 Issue 1-6. +
- +
-Salcedo Huratdo Elkin De J., Vargas C. A.  and Triviño M. Report of the focal mechanism database. Topic 3: Modelling the subduction process along the western coast and creation of a source model to be used for hazard calculations. GEM SARA Internal Report, Fundacion Universidad del Valle, 2015a. +
- +
-Salcedo Huratdo Elkin De J., Vargas C. A.  and Triviño M. Modeling the subduction process along the western coast and creation of a source model to be used for hazard calculations. Topic 3: Modelling the subduction process along the western coast and creation of a source model to be used for hazard calculations. GEM Technical report, Fundacion Universidad del Valle, 2015b. Progress Report, March 2015b. +
  
  • hazard_rt3.1458835008.txt.gz
  • Last modified: 2016/03/24 16:56
  • by Julio Garcia