Basement depths in the Parecis Basin (Amazon) with receiver functions from small local earthquakes in the Porto dos Gaúchos seismic zone

Barros, Lucas Vieira; Assumpção, Marcelo

doi:10.1016/j.jsames.2011.04.002

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…This seems to be the basement general direction. These directions are very similar to structures with ENE-WSW orientation which are mentioned byBARROS & ASSUMPÇÃO (2011).…”

supporting

confidence: 79%

“…There are few studies that specifically addressed the magnetic signatures from Caiabis Basin. However, there are several works in which it has been approached the geophysical signatures from Parecis Basin and some of structural aspects from Caiabis Basin, especially regarding the basement depth in its SE portion (BRAGA & SIQUEIRA (1995) apud BARROS & ASSUMPÇÃO, 2011;SANTOS & FLEXOR, 2012;SIQUEIRA, 1989;BAHIA et al, 2007;FARIA, 2015). According to some of these studies, basement depth in the SE portion from CB is located between 4 and 8 km (SANTOS & FLEXOR, 2012; BRAGA & SIQUEIRA, 1995) and may reach up to 10 km of depth (FARIA, 2015).…”

Section: Discussionmentioning

confidence: 99%

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Interpretation of Magnetic Anomalies of the Caiabis Basin, Southwestern Amazonian Craton, Brazil

Silva¹,

Severino²,

Gonçalves³

2019

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef

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“…This seems to be the basement general direction. These directions are very similar to structures with ENE-WSW orientation which are mentioned byBARROS & ASSUMPÇÃO (2011).…”

supporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Interpretation of Magnetic Anomalies of the Caiabis Basin, Southwestern Amazonian Craton, Brazil

Silva¹,

Severino²,

Gonçalves³

2019

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef

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“…Following the methodology developed by Barros and Assumpção (2011) in order to determine the sediment thickness in the Phanerozoic Parecis Basin, Dias et al (2018) found that the Phanerozoic Parnaiba Basin presents in the epicentral area, a sedimentary package with a thickness of 500m. For the sediments, we adopted a Vp of 4,0 km/s and for the second layer, 10km thick, the velocity of 6.0 km/s.…”

Section: Velocity Modelmentioning

confidence: 99%

Maranhão earthquake of January 3, 2018 - a new GT5 event in the aseismic region of the Brazilian phanerozoic Parnaiba Basin

Barros¹,

Rocha²,

Assumpção³

et al. 2018

Proceedings of the VIII Simpósio Brasileiro E Geofísica

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Here it is presented the preliminary results of study, with local network, of the aftershock activity occurred in the aseismic region of Vargem Grande, Maranhão state, after a 4.6 mb mainshock on January 3, 2017. The focal mechanism solution indicates a strike slip fault with compression parallel to the cost line in agreement with previous studies. The aftershock activity was very intense in the begin fading to just few events after couple of days and the aftershock network only registered 60 events within two months. Hypocentral location of 10 events showed a possible trace of the fault in agreement with focal mechanism solution. The relocation of the main event with station correction and fixed depth was located within the aftershock cluster with accuracy of a GT5 event requirements.

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“…Moreover, based on the contour map of gravity also can be derived basement depths [20] [21]. The highs and lows in the Bouguer gravity anomalies were interpreted as basement highs and lows [21].…”

Section: Subsurface Characteristicsmentioning

confidence: 99%

Understanding of Earthquake Damage Pattern through Geomorphological Approach: A Case Study of 2006 Earthquake in Bantul, Yogyakarta, Indonesia

Medan¹,

Yogyakarta²,

Cologne³

2014

WJET

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The last major earthquake in Bantul causing severe damage occurred on May 27 th , 2006. The damages in the flat area of Bantul had a certain pattern. The damages pattern controlled the subsurface characteristic below the flat area. Understanding earthquake damage pattern through geomorphological approach is important for earthquake hazard analysis. The techniques of remote sensing and Geographical Information Systems were applied to analyze earthquake damage pattern and geomorphological characteristics. Gravity analysis was used to identify the subsurface structure and the basement depth while geoelectric analysis was used to identify sediment depth. Moreover, spatial correlation analysis was used to identify the relationship between the earthquake damage, geomorphological characteristics, and subsurface characteristics. The results show that fluvial, marine, and aeolian landforms have low rock density value based on gravity analysis. These indicate that they were composed by thick unconsolidated material of quaternary alluvium. While denudational, structural, and solutional landforms composed by material of tertiary rocks have high rock density value. The severe damage occurred in the area that has a lower value of local gravity and deeper basement. In contrast, the slight damage occurred in the area that has higher values of local gravity and shallower basement. Moreover, the severe damage occurred in areas of thicker sediment that consist of unconsolidated material. Consequently, the area of unconsolidated material that has deeper basement and thicker sediment is prone to earthquake. They were located on fluvial, marine, and aeolian landforms.

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Basement depths in the Parecis Basin (Amazon) with receiver functions from small local earthquakes in the Porto dos Gaúchos seismic zone

Cited by 7 publications

References 23 publications

Interpretation of Magnetic Anomalies of the Caiabis Basin, Southwestern Amazonian Craton, Brazil

Interpretation of Magnetic Anomalies of the Caiabis Basin, Southwestern Amazonian Craton, Brazil

Maranhão earthquake of January 3, 2018 - a new GT5 event in the aseismic region of the Brazilian phanerozoic Parnaiba Basin

Understanding of Earthquake Damage Pattern through Geomorphological Approach: A Case Study of 2006 Earthquake in Bantul, Yogyakarta, Indonesia

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