<p>In this research, the rupture process and characteristics of the seismic source of the Yauca-Arequipa earthquake occurred on January 14, 2018 was studied using the teleseismic waveform inversion method from stations of the Global Seismographic Network. The teleseismic inversion results indicates a complex or multiple rupture process with a total duration of around 50 s for a rupture velocity of 2.0 km/s. The focal mechanism was of the reverse fault type (strike = 310<InlineEquation ID="IEq1"> <EquationSource Format="TEX">$^\circ $</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mo>∘</mo> </mmultiscripts> </math></EquationSource> </InlineEquation>, dip = 46<InlineEquation ID="IEq2"> <EquationSource Format="TEX">$^\circ $</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mo>∘</mo> </mmultiscripts> </math></EquationSource> </InlineEquation>, rake = 76<InlineEquation ID="IEq3"> <EquationSource Format="TEX">$^\circ $</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mo>∘</mo> </mmultiscripts> </math></EquationSource> </InlineEquation>), according to the seismotectonic setting of the southern region of Peru. We notice that the rake shows a non-negligible oblique component. We have estimated the seismic moment as 4.84<InlineEquation ID="IEq4"> <EquationSource Format="TEX">$\times 10^{19}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>×</mo> <msup> <mn>10</mn> <mn>19</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> Nm, corresponding to a moment magnitude of Mw 7.1, for a focal depth of 29 km. The maximum slip was 1.22 m. As a coseismic effect, a small and local tsunami was triggered, the maximum observed amplitude at the Marcona station was around 17 cm and we obtained a maximum simulated amplitude of 17 cm for a constant rigidity of 6.4 <InlineEquation ID="IEq5"> <EquationSource Format="TEX">$\times 10^{10}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>×</mo> <msup> <mn>10</mn> <mn>10</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> N/m<InlineEquation ID="IEq6"> <EquationSource Format="TEX">$^2$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>2</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>. It was necessary the issue of a tsunami “advisory” for the Peruvian coast.</p>

Numerical Simulation of the 2018 Yauca Peru Earthquake and Tsunami (Mw 7.1) to Obtain the Slip Distribution

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2026年3月10日

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Cesar Jimenez,
Nestor Luna,
Bruno Adriano

摘要

In this research, the rupture process and characteristics of the seismic source of the Yauca-Arequipa earthquake occurred on January 14, 2018 was studied using the teleseismic waveform inversion method from stations of the Global Seismographic Network. The teleseismic inversion results indicates a complex or multiple rupture process with a total duration of around 50 s for a rupture velocity of 2.0 km/s. The focal mechanism was of the reverse fault type (strike = 310 $^\circ $ $^{\circ}$ , dip = 46 $^\circ $ $^{\circ}$ , rake = 76 $^\circ $ $^{\circ}$ ), according to the seismotectonic setting of the southern region of Peru. We notice that the rake shows a non-negligible oblique component. We have estimated the seismic moment as 4.84 $\times 10^{19}$ $\times 10^{19}$ Nm, corresponding to a moment magnitude of Mw 7.1, for a focal depth of 29 km. The maximum slip was 1.22 m. As a coseismic effect, a small and local tsunami was triggered, the maximum observed amplitude at the Marcona station was around 17 cm and we obtained a maximum simulated amplitude of 17 cm for a constant rigidity of 6.4 $\times 10^{10}$ $\times 10^{10}$ N/m $^2$ $^{2}$ . It was necessary the issue of a tsunami “advisory” for the Peruvian coast.