Aftershock patterns of the 2021 Mw 6.3 Northern Thessaly (Greece) earthquake

Michas, Georgios; Pavlou, Kyriaki; Avgerinou, Sophia-Ekaterini; Anyfadi, Eleni-Apostolia; Vallianatos, Filippos

doi:10.1007/s10950-021-10070-9

Cited by 9 publications

(9 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In all cases, the qlogarithmic function describes the observed distributions with high correlation coefficients, shown in the corresponding panels. The high values of q τ (Table 6) indicate long-range temporal correlations in the evolution of the earthquake activity and further confirm the high q τ values observed in aftershock sequences [84,[96][97][98].…”

Section: The Interevent Times Distributions For the Foreshock And Aft...supporting

confidence: 72%

On the Patterns and Scaling Properties of the 2021–2022 Arkalochori Earthquake Sequence (Central Crete, Greece) Based on Seismological, Geophysical and Satellite Observations

et al. 2022

Self Cite

View full text Add to dashboard Cite

The 27 September 2021 damaging mainshock (Mw6.0) close to Arkalochori village is the strongest earthquake that was recorded during the instrumental period of seismicity in Central Crete (Greece). The mainshock was preceded by a significant number of foreshocks that lasted nearly four months. Maximum ground subsidence of about 18 cm was estimated from InSAR processing. The aftershock sequence is located in an almost NE-SW direction and divided into two main clusters, the southern and the northern ones. The foreshock activity, the deformation area, and the strongest aftershocks are located within the southern cluster. Based on body-wave travel times, a 3-D velocity model was developed, while using combined space and ground-based geodetic techniques, the co-seismic ground deformation is presented. Moreover, we examined the co-seismic static stress changes with respect to the aftershocks’ spatial distribution during the major events of the foreshocks, the Mw = 6.0 main event as well as the largest aftershock. Both the foreshock and the aftershock sequences obey the scaling law for the frequency-magnitude distribution as derived from the framework of non-extensive statistical physics (NESP). The aftershock production rate decays according to the modified Omori scaling law, exhibiting various Omori regimes due to the generation of secondary aftershock sequences. The analysis of the inter-event time distribution, based on NESP, further indicates asymptotic power-law scaling and long-range correlations among the events. The spatiotemporal evolution of the aftershock sequence indicates triggering by co-seismic stress transfer, while its slow migration towards the outer edges of the area of the aftershocks, related to the logarithm of time, further indicates a possible afterslip.

show abstract

Section: The Interevent Times Distributions For the Foreshock And Aft...supporting

confidence: 72%

On the Patterns and Scaling Properties of the 2021–2022 Arkalochori Earthquake Sequence (Central Crete, Greece) Based on Seismological, Geophysical and Satellite Observations

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…By further carrying out the changes in the variables:

and considering the q -exponential function given in Equation (3), Equation (12) can be written as [ 26 , 68 ]:

…”

Section: Discussionmentioning

confidence: 99%

“…The main advantage of using NESP is that all length correlations and memory effects are considered in the temporal evolution of seismicity, including BG statistical physics as a particular case [ 18 , 19 , 20 , 21 , 22 ]. In this work, the temporal scaling characteristics of major subduction zone aftershock sequences in terms of NESP were studied by estimating the probability distribution of the interevent times between successive aftershocks and its non-additive entropic parameter ( q ) [ 12 , 18 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. We show that the observed probability distributions present a universal behavior with a crossover from power-law ( q ≠ 1) to exponential ( q = 1) scaling at longer interevent times.…”

Section: Introductionmentioning

confidence: 99%

Universal Non-Extensive Statistical Physics Temporal Pattern of Major Subduction Zone Aftershock Sequences

Anyfadi

Avgerinou

Michas

et al. 2022

Entropy

Self Cite

View full text Add to dashboard Cite

Large subduction-zone earthquakes generate long-lasting and wide-spread aftershock sequences. The physical and statistical patterns of these aftershock sequences are of considerable importance for better understanding earthquake dynamics and for seismic hazard assessments and earthquake risk mitigation. In this work, we analyzed the statistical properties of 42 aftershock sequences in terms of their temporal evolution. These aftershock sequences followed recent large subduction-zone earthquakes of M ≥ 7.0 with focal depths less than 70 km that have occurred worldwide since 1976. Their temporal properties were analyzed by investigating the probability distribution of the interevent times between successive aftershocks in terms of non-extensive statistical physics (NESP). We demonstrate the presence of a crossover behavior from power-law (q ≠ 1) to exponential (q = 1) scaling for greater interevent times. The estimated entropic q-values characterizing the observed distributions range from 1.67 to 1.83. The q-exponential behavior, along with the crossover behavior observed for greater interevent times, are further discussed in terms of superstatistics and in view of a stochastic mechanism with memory effects, which could generate the observed scaling patterns of the interevent time evolution in earthquake aftershock sequences.

show abstract

“…The duration of seismic turbulence in the early hours after the occurrence of the main earthquake in the region is determined by c, the decay trend of aftershocks begins. These parameters and essentially the aftershock production rate depend on various properties peculiar to the seismogenic region, such as the tectonic setting, the stress changes along the regional faults, the structural heterogeneities, and the crustal rheology (Utsu et al, 1995;Shcherbakov et al, 2004;Valerio et al, 2017, Michas et al, 2022.…”

Section: Methodsmentioning

confidence: 99%

“…Vallianatos et al 2012Vallianatos et al , 2016Vallianatos et al , 2018 Vallianatous and Michas, 2020;Michas et al 2022). To investigate the probability distribution p(τ), the histogram of waiting times τ is constructed, preferably in logarithmically spaced bins.…”

mentioning

confidence: 97%

Investigation of the reduction pattern of aftershocks in the Iranian plateau

Rostam

2022

Preprint

View full text Add to dashboard Cite

The Iranian plateau is one of the most active and seismic areas, which is located in the Alpine-Himalayan seismic belt. This area has experienced many devastating earthquakes. The study of seismic behavior and the occurrence pattern of aftershocks of medium to large earthquakes can be important for this region. Twenty six earthquakes larger than 5 have been selected on the Iranian plateau in the last ten years to investigate their aftershocks behaviour. First the seismic parameters Mc, a and b-value were estimated by drawing the Gutenberg-Richter diagram using the maximum likelihood estimation method in ZMAP software. Then, events less than Mc were removed from the catalog. The remaining catalog was used to determine the parameters of modified Omori law for each event separately. The average value of p in Zagros and Alborz is 1.07, while this value is 0.99 for Central Iran and Kope Dagh. This can be caused by high seismic activity and rapid energy discharge by small earthquakes. Furthermore, in this study, a model for the distribution of the probability function of the waiting time of aftershock sequences of the Iranian plateau has been determined.

show abstract

Aftershock patterns of the 2021 Mw 6.3 Northern Thessaly (Greece) earthquake

Cited by 9 publications

References 79 publications

On the Patterns and Scaling Properties of the 2021–2022 Arkalochori Earthquake Sequence (Central Crete, Greece) Based on Seismological, Geophysical and Satellite Observations

On the Patterns and Scaling Properties of the 2021–2022 Arkalochori Earthquake Sequence (Central Crete, Greece) Based on Seismological, Geophysical and Satellite Observations

Universal Non-Extensive Statistical Physics Temporal Pattern of Major Subduction Zone Aftershock Sequences

Investigation of the reduction pattern of aftershocks in the Iranian plateau

Contact Info

Product

Resources

About