Structural control on the directional amplification of seismic noise (Campo Imperatore, central Italy)

Pischiutta, Marta; Fondriest, Michele; Demurtas, Matteo; Magnoni, Federica; Toro, Giulio Di; Rovelli, A.

doi:10.1016/j.epsl.2017.04.017

Cited by 40 publications

(38 citation statements)

References 38 publications

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“…Direct characterization of the internal structure of brittle fault zones in the subsurface is limited to sparse borehole data, while seismic and other geophysical methods (e.g., tomography based on different observables) can provide high‐quality 2‐D or 3‐D characterizations but still affected by noise and resolution limits (e.g., Amoroso et al, 2017; Ben‐Zion, 1998; Cochran et al, 2009; Hale, 2013; Iacopini et al, 2016; Pischiutta et al, 2017; Vidale & Li, 2003). In the case of seismogenic fault zones, modern techniques of aftershock relocation (i.e., double difference method and earthquake detection algorithms with deep neural networks) allowed seismologists to illuminate with unprecedented internal spatial resolution (~10 m of relocation precision for correlated events) the three‐dimensional fault networks activated during seismic sequences (Chiaraluce et al, 2011; Ross et al, 2020; Valoroso et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Structural Complexity and Mechanics of a Shallow Crustal Seismogenic Source (Vado di Corno Fault Zone, Italy)

et al. 2020

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The mechanics and seismogenic behavior of fault zones are strongly influenced by their internal structure. In this perspective, the internal structure of the extensional seismically active Vado di Corno Fault Zone (VCFZ, Central Apennines, Italy) was quantified by combining high-resolution structural mapping with 3-D fault network analysis over ∼2 km along fault strike. The fault zone was exhumed from ∼2 km depth in carbonate rocks, accommodated 1.5-2 km of extensional throw since Early Pleistocene, and cuts through the Pliocene Omo Morto Thrust Zone (OMTZ) with partial reactivation in extension. The exceptional exposure of the footwall block allowed us to reconstruct in detail the geometry of the OMTZ and quantify the spatial arrangement of master/subsidiary faults and fault zone rocks within the extensional VCFZ. The combination of the structural map and the 3-D fault network with kinematic and topological analyses pointed out the crucial role of the older thrust geometry (i.e., lateral ramps) in controlling the along-strike segmentation and slip distribution of the VCFZ. These observations were discussed in the framework of regional extension through a slip tendency analysis and a simplified mechanical model, which suggest the activation of oblique inherited structures during the lateral propagation of the VCFZ segments. The interaction of the VCFZ with the OMTZ generated along strike and possibly downdip mechanical asperities. Considering the exhumed VCFZ as an analog for the shallow structure of other seismic sources in the Central Apennines, similar settings could play first-order control on the spatio-temporal evolution and rupture heterogeneity of earthquakes in the region.

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Section: Introductionmentioning

confidence: 99%

Structural Complexity and Mechanics of a Shallow Crustal Seismogenic Source (Vado di Corno Fault Zone, Italy)

et al. 2020

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“…They occur near or at the El Salvador Fault Zone, independent of the distance and origin of the earthquake, indicating an important control of the existing faults in guiding large liberation of seismic energy (García Flórez and Tsige, 2011). These elements can act as channels through which the seismic waves travel, resulting in an energy entrapment, and therefore in a larger ground motion that can trigger deep-seated landslides even in gentle slopes (Imposa et al, 2004;Pischiutta et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Failure Mechanism of Large Landslides Triggered by Earthquakes in the El Salvador Fault Zone: The Case of Jiboa Landslide

Peces¹,

Tsigé²,

García-Flórez³

2018

Geological Society of America Abstracts With Programs

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“…Gejala likuefaksi akan berkorelasi dengan tinginya nilai indeks kerentanan seismik (seismic vulnerability index) yang bersumber pada nilai properti fisis batuan. Keberadaan properti fisis batuan yang rentan atau porus dan lapuk akan memungkinkan fluida dominan untuk menekan dan menggeser lapisan batuan di permukaan [4].…”

Section: Wilayahunclassified

Investigasi Kerentanan Tanah Berpotensi Likuifikasi Menggunakan Metode Mikroseismik Di Wilayah Prambanan, Yogyakarta

Aditama

Saadi

Nurcahya

2020

DINAREK

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<p>Metode mikroseismik merupakan suatu metode pasif seismik yang menggunakan sumber pasif bumi. Metode ini dapat digunakan untuk menganalisis potensi efek kerentanan tanah di sekitar wilayah Prambanan, Yogyakarta, Indonesia. Studi kali ini berlandaskan pada teori gempa bumi yang dapat memicu mengaktifkan bahaya lain seperti likuifaksi yang disebabkan karena tanah kehilangan kekuatan akibat kehilangan tegangan yang berasal dari pori batuan yang terisi oleh fluida. Dengan demikian, informasi tentang potensi likuifaksi diperlukan untuk mencegah kerusakan, pada hal ini terfokus pada candi Prambanan. Teknik pengukuran dan analisis mikrotremor telah berhasil untuk mengidentifikasi keberadaan kerentanan tanah dan potensinya terhadap likuifaksi dengan cara mikrozonasi di banyak tempat di seluruh dunia. Makalah ini menyajikan studi eksperimental mikrotremor untuk penyelidikan karakteristik tanah berdasarkan tiga parameter seismik pasif yaitu frekuensi dominan (f0), amplifikasi (A0), dan indeks kerentanan seismic (SVI). Dilakukan pengambilan data sebanyak 56 titik titik di sekitar candi Prambanan untuk menyelidiki sifat-sifat tanah di daerah ini. Dalam hasil penelitian ini, perlu dicatat bahwa karakteristik mikrotremor tergantung pada jenis endapan tanah dengan menghasilkan nilai amplifikasi diatas 4 dan nilai indeks SVI berada pada 20 - 100. Dengan demikian, wilayah penelitian termasuk pada zona berbahaya potensi likuifaksi apabila terjadi gempa lokal maupun regional, terkhusus di wilayah utara dan timur, dibuktikan dengan distribusi nilai Ao dan SVI yang tinggi. Peta mikrozonasi dari hasil penelitian ini diharapkan dapat digunakan sebagai referensi untuk pembangunan dan perencanaan kota di sekitar Prambanan dan mendorong inovasi untuk mengurangi dampak kerentanan seismik dan likuifaksi di sekitar Candi Prambanan</p>

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Structural control on the directional amplification of seismic noise (Campo Imperatore, central Italy)

Cited by 40 publications

References 38 publications

Structural Complexity and Mechanics of a Shallow Crustal Seismogenic Source (Vado di Corno Fault Zone, Italy)

Structural Complexity and Mechanics of a Shallow Crustal Seismogenic Source (Vado di Corno Fault Zone, Italy)

Failure Mechanism of Large Landslides Triggered by Earthquakes in the El Salvador Fault Zone: The Case of Jiboa Landslide

Investigasi Kerentanan Tanah Berpotensi Likuifikasi Menggunakan Metode Mikroseismik Di Wilayah Prambanan, Yogyakarta

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