A 220,000-year-long continuous large earthquake record on a slow-slipping plate boundary

Flashcards about the article: A 220,000-year-long continuous large earthquake record on a slow-slipping plate boundary

What does the research article by Lu et al. (2020) discuss?

A 220,000-year-long continuous large earthquake record on a slow-slipping plate boundary.

The seismological catalog was enhanced for which fault zone?

Dead Sea Fault Zone.

What is the mean recurrence time of large earthquakes according to the analysis?

1400 ± 160 years.

What does the study confirm about the earthquake recurrence pattern?

A clustered earthquake recurrence pattern and a group-fault temporal clustering model.

Large earthquakes (Mw ≥ 7.0) usually have recurrence intervals longer than what?

Modern seismograph operation time span.

Subaqueous paleoseismology exploits what to retrieve longer records of paleoseismic shaking?

Lacustrine and marine sediments.

Name examples of geometrically simple and fast-slipping strike-slip faults with regular recurrence patterns.

Alpine Fault in New Zealand, and Wrightwood Section of the San Andreas Fault.

What is the short-term slip-rate estimate from GPS measurements along the central to southern part of the Dead Sea Fault?

4.2 to 5.8 mm year−1.

What did Seilacher (10) and El-Isa and Mustafa (11) hypothesize about the eastern Dead Sea margin?

Asymmetric folds of unlithified sediments.

What process did Heifetz et al. (17) propose as a plausible driver for folding and shattering in the soft sediments in the Dead Sea Basin?

Earthquake-forced shear, leading to sediment turbulence called the Kelvin-Helmholtz instability.

Numerical simulations confirm that the observed textures of sediment layers are a proxy for what?

Minimum ground accelerations.

What core is investigated in the study to analyze earthquakes recorded in the sedimentary sequence of the Dead Sea depocenter?

ICDP Core 5017-1.

What serves as sensitive markers for identifying earthquake-induced deformation in the sedimentary sequence of the ICDP Core 5017-1?

Alternating laminae of white aragonite and dark detritus.

Name the forms of folded aragonite-detritus laminae found in the drilling core from the Dead Sea depocenter.

Linear waves, asymmetric billows, and coherent vortices.

What features indicate the in situ deformation process of intraclast breccia layers?

Lack of erosion processes at the base of the layer and remaining parts of in situ folded layer.

According to the numerical simulations, what minimum acceleration is required for a layer of linear waves, asymmetric billows, coherent vortices, and intraclast breccia, respectively?

0.13, 0.18, 0.34, and 0.50g.

What is the mean return time of the 413 acceleration ≥0.13g events that Core 5017-1 records?

530 ± 40 (SEM) years.

Why is magnitude estimation based on a single station difficult?

Because ground motion effects of a moderate earthquake nearby generate similar shaking intensities to those generated by a large earthquake farther away.

What is the lower-bound magnitude of the recorded PGA ≥ 0.13g events, according to the three regional empirical attenuation relations?

Mw ≥ 5.3.

What paleoseismic record from Kagan et al. (21) is incorporated into the 220-ka paleoseismic series?

Speleoseismites from damaged cave deposits in the Soreq and Har-Tuv Caves.