Using Multi-Frequency Insar Data to Constrain Ground Deformation of Ischia Earthquake

Montuori, Antonio; Albano, Matteo; Polcari, Marco; Atzori, Simone; Bignami, Christian; Tolomei, Cristiano; Pezzo, Giuseppe; Mora, Marco; Saroli, Michele; Stramondo, Salvatore; Salvi, Stefano

doi:10.1109/igarss.2018.8519372

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…Epomeo [9,16] (Figure 7a). This is consistent also with the hypothesis of a source model for the 2017 Casamicciola earthquake made using InSar data [17,70], showing a shear fault, E-W oriented, N-dipping, with a pure normal mechanism and an average seismic slip of~13 cm (Figure 7b). The comparison between measured and computed ground deformations (Figure 7) highlights a fairly good correlation therefore the modelled deformation amplitude is similar to the coseismic observations.…”

Section: Discussionsupporting

confidence: 90%

“…We analyzed the macroseismic intensity of the 21 August 2017, Md 4.0, Casamicciola Terme earthquakes using the ESI scale, and generated a new isoseismal map (Figure 5). This allows to better constrain the causative fault for this shallow focus, damaging event, in agreement with previous studies modelling the source as a shallow, E-trending, N-dipping normal fault located between Bagni and Fango, capable to generate a 2 km long surface rupture (e.g., [4,32,70]). Integrated models based on geological, geodetic and seismological datasets are the best tool for unravelling the seismic behavior along the N slope of Mt.…”

Section: Discussionsupporting

confidence: 86%

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The 2017, MD = 4.0, Casamicciola Earthquake: ESI-07 Scale Evaluation and Implications for the Source Model

et al. 2021

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On 21 August 2017 at 20:57 (local time) a very shallow (H = 1.2 km), moderate (Md = 4.0), earthquake hit the volcanic island of Ischia (Southern Italy), causing the death of two people. The study of the damage to the buildings with the European Macroseismic Scale 98 (EMS-98), carried out immediately after the earthquake, highlighted that hilly area of Casamicciola Terme, on the northern side of the Mt. Epomeo, was the most damaged part of the island with locally quite relevant damage (I = VIII EMS). This seismic event is the first damaging earthquake in Ischia during the instrumental era. In fact, this provides, for the first time, the opportunity to integrate historical seismicity, macroseismic observations, instrumental information, and detailed mapping of the geological coseismic effects. In this work we evaluate the effects induced by the 2017 Casamicciola earthquake on the environment using the Environmental Seismic Intensity 2007 (ESI-07) macroseismic scale. This macroseismic analysis, together with the superficial coseismic faulting characteristics and the available geophysical information, allows us to reconsider the source model for the 2017 earthquake and the previous damaging historical earthquakes in the Casamicciola Terme area. The application of the ESI scale to the Casamicciola Terme earthquake of 21 August 2017 and the assignment of seismic intensity offers better spatial resolution, as well as an increase of the time window for the assessment of the seismic hazard, allowing to reduce the implicit uncertainty in the intensity attenuation laws in this peculiar volcano-tectonic setting. Since intensity is linked to the direct measure of damage, and it is commonly used in hazard assessment, we argue that building damage at Casamicciola Terme is strongly influenced by earthquake surface faulting and near field effects, and therefore controlled by the geometry of the seismic source.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 86%

The 2017, MD = 4.0, Casamicciola Earthquake: ESI-07 Scale Evaluation and Implications for the Source Model

et al. 2021

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“…Epomeo. The observed ground deformation anomaly results properly correlated with the fault motion at surface, as it has been hypothesized in the geological source model by Nappi et al, [2018] and InSAR source model by Montuori et al, [2018] and Albano et al, [2018] . These Authors consider the reactivation of the E-W fault systems, northward dipping, that borders the Mt Epomeo's northern flank, as the tectonic structure responsible for the August 21, 2017 Casamicciola earthquake.…”

Section: Discussionsupporting

confidence: 78%

High precision leveling survey following the Md 4.0 Casamicciola earthquake of August 21, 2017 (Ischia, Southern Italy): field data and preliminary interpretation

Ricco

Alessio

Aquino

et al. 2018

Annals of Geophysics

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The aim of this paper is the presentation of the results obtained from the high precision leveling survey carried out from November 6 to 11, 2017, in the area hit by the Md 4.0 Casamicciola earthquake of August 21, 2017, and critical discussion of these results in the light of the possible seismic source models. The measurements have been carried out on benchmarks of the northwestern sector of the altimetric network of the Ischia island, in the epicentral area. The heights of each benchmark have been obtained considering the historical reference benchmark n.1 located at Ischia Porto, and have been compensated over the whole stretch of the measured network; such heights have also been compared with those derived from the previous leveling campaign that was performed along the entire network in June 2010. The results obtained from the specific investigated leveling lines, which are considered representative of the kinematics of the northwestern area of the island, show conspicuous anomalies of ground deformation in the epicentral area of the August 21, 2017 earthquake.In particular, a significant ground subsidence of about 3.5 centimeters has been found between the benchmarks n. 92 and n. 98A along the "Borbonica Line", quite anomalous compared to the previous measurements. Such subsidence located between the Piazza Maio (Casamicciola) and Fango (Lacco Ameno) localities, results spatially correlated with the deformation detected by the InSAR data analysis and coincides with the greatest macroseismic damages and with the coseismic surface fracture systems E-W oriented. Future leveling campaign in the area would be very crucial in order to follow and define the rate of postseismic motion of the seismogenetic source, also contributing with independent and valuable data to the seismic hazard knowledge of the Ischia island.

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“…This subsidence stage is reported to be at a rate of up to 10 mm/yr, primarily affecting the south-central region of the island. Furthermore, local northwest ground subsidence was also noted, following the Casamicciola earthquake on 21 August 2017 [41][42][43]52].…”

Section: Geological and Seismological Backgroundmentioning

confidence: 99%

“…2 km segment along the Etrending and N-dipping normal fault, which runs at the base of Mt. Epomeo and forms the master fault of the CHG [24,25,[41][42][43]. However, more faulting evidence is needed, between the mapped coseismic ruptures by [24] and the progressive offset along the normal fault of the northern flank of Mt.…”

Section: Introductionmentioning

confidence: 99%

Improving the Accuracy of Digital Terrain Models Using Drone-Based LiDAR for the Morpho-Structural Analysis of Active Calderas: The Case of Ischia Island, Italy

Silva-Fragoso,

Norini,

Nappi

et al. 2024

Remote Sensing

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Over the past two decades, the airborne Light Detection and Ranging (LiDAR) system has become a useful tool for acquiring high-resolution topographic data, especially in active tectonics studies. Analyzing Digital Terrain Models (DTMs) from LiDAR exposes morpho-structural elements, aiding in the understanding of fault zones, among other applications. Despite its effectiveness, challenges persist in regions with rapid deformation, dense vegetation, and human impact. We propose an adapted workflow transitioning from the conventional airborne LiDAR system to the usage of drone-based LiDAR technology for higher-resolution data acquisition. Additionally, drones offer a more cost-effective solution, both in an initial investment and ongoing operational expenses. Our goal is to demonstrate how drone-based LiDAR enhances the identification of active deformation features, particularly for earthquake-induced surface faulting. To evaluate the potential of our technique, we conducted a drone-based LiDAR survey in the Casamicciola Terme area, north of Ischia Island, Italy, known for the occurrence of destructive shallow earthquakes, including the 2017 Md = 4 event. We assessed the quality of our acquired DTM by comparing it with existing elevation datasets for the same area. We discuss the advantages and limitations of each DTM product in relation to our results, particularly when applied to fault mapping. By analyzing derivative DTM products, we identified the fault scarps within the Casamicciola Holocene Graben (CHG) and mapped its structural geometry in detail. The analysis of both linear and areal geomorphic features allowed us to identify the primary factors influencing the current morphological arrangement of the CHG area. Our detailed map depicts a nested graben formed by two main structures (the Maio and Sentinella faults) and minor internal faults (the Purgatorio and Nizzola faults). High-resolution DEMs acquired by drone-based LiDAR facilitated detailed studies of the geomorphology and fault activity. A similar approach can be applied in regions where the evidence of high slip-rate faults is difficult to identify due to vegetation cover and inaccessibility.

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Using Multi-Frequency Insar Data to Constrain Ground Deformation of Ischia Earthquake

Cited by 7 publications

References 6 publications

The 2017, MD = 4.0, Casamicciola Earthquake: ESI-07 Scale Evaluation and Implications for the Source Model

The 2017, MD = 4.0, Casamicciola Earthquake: ESI-07 Scale Evaluation and Implications for the Source Model

High precision leveling survey following the Md 4.0 Casamicciola earthquake of August 21, 2017 (Ischia, Southern Italy): field data and preliminary interpretation

Improving the Accuracy of Digital Terrain Models Using Drone-Based LiDAR for the Morpho-Structural Analysis of Active Calderas: The Case of Ischia Island, Italy

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