Category: Publications

Could the 2019 M=6.4 Yamagata-Oki, Japan, earthquake be an aftershock of an M=7.5 event that struck in 1964

Previous research suggests that not until halfway through the rupture—90 seconds for an M=9 shock—can one predict its magnitude, but new findings could bring this down to 10-15 sec, which would greatly extend and enhance Earthquake Early Warnings.

The mysterious ‘Fontana Trend’ lit up in shallow and widely felt shocks during the past week, putting residents on edge. The swarm lies near the junction of the major Sierra Madre and San Jacinto Faults.

We welcome inquiries from scientists and institutions for such an ambitious yet discounted project. Resources from ICDP, national funding agencies, and potentially other foundations could be leveraged to take advantage of this unique tectonic and temporal opportunity.

Debido a su ubicación costa afuera y una profundidad moderada, el temblor del jueves provocó pocos daños. Pero varios indicios sugieren que la suerte de El Salvador no durará por mucho más. Este evento también resalta el creciente número de terremotos extensionales grandes: una tendencia global con implicaciones de peligro importantes.

Because of its offshore location and moderate depth, Thursday’s shock did little damage. But many indications suggest that El Salvador will not stay so lucky for long. This event also highlights the increasing number of large extensional earthquakes: a global trend with important hazard implications.

A magnitude-8.0 quake shook deep below the Amazon Rainforest in Peru, causing extensive liquefaction and shaking from Colombia to Chile.

A magnitude-7.5 quake broke the same fault that produced a magnitude-8.0 quake in 2000, an extraordinarily short recurrence time that also broke all our rules

An open invitation for researchers to use these remarkable Costa Rica quakes as a collaboration laboratory

Two deadly and damaging quakes late last month were probably unrelated to each other.

The authors claim they found dynamic triggering of tiny aftershocks up to 275 km (150 mi)
from an M=7.2 mainshock in 2010, but they have not proved their case.

While exact repeats of earthquakes are rare, if the 1906 quake did strike again, what will be our excuse for being so unprepared?

In one case, the fault rupture and its associated seismicity had been shifted toward a volcano in support of the author’s hypothesis; in the other, seismograms from temporary near-fault stations had been manufactured. In both cases, evaluation committees and universities called for retractions.

A new model joins two others in confirming the hazard posed by the tectonic forces that are squeezing and shearing greater LA.

India is one of the countries with the most earthquake-related deaths. Just in the past century, over 100.000 people have died due to earthquakes in the country (Bilham, 2009)

The megathrust fault lacks large subduction zone earthquakes in this region. What do these extensional earthquakes tell us?

The earthquake is surrounded by recent great quakes; whether one could strike here is uncertain

The Coquimbo region has an unusual, increasing seismicity that may be preparing the area for a very large earthquake – Prof. Raul Madariaga

One may think that these quakes are small, so why do they matter? Why should I care?

The partial shutdown could make things worse

Japanese authorities declared the Jan 3 shock to be an independent event; we argue that it was a product of the 2016 quake, which profoundly changed the hazard.

It’s been over four months since we wrote about the powerful Kumamoto quake sequence: The 15 April 2016 Mw=6.2 (Mjma 6.5) Kumamoto, Japan, shock, which was succeeded 28 hours later by the very damaging Mw=7.0 (Mjma 7.3) shock on the same fault system. We can now give you a preview of crucial new discoveries by Japanese and other researchers.

Could this happen again now? As with precursory swarms, progressive earthquake sequences are uncommon.

Was the M=6.1 a foreshock of the M=7.0, or was the M=7.0 an aftershock of the M=6.1?