Are asperity patterns persistent? Implication from large earthquakes in Papua New Guinea

Park, Sun-Cheon; Mori, Jim

doi:10.1029/2006jb004481

Cited by 33 publications

(38 citation statements)

References 22 publications

(57 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is likely the main reason that neither the slippredictable nor the time-predictable models apply, and why the 2007 earthquakes didn't grow as big as in 1833. This adds to the view that seismic asperities are probably not permanent features 29 but rather move around from one rupture to another within the area that is locked in the interseismic period.…”

mentioning

confidence: 92%

Partial rupture of a locked patch of the Sumatra megathrust during the 2007 earthquake sequence

Konca

Avouac

Sladen

et al. 2008

Nature

323

369

View full text Add to dashboard Cite

Here we show that these earthquakes ruptured only a fraction of the area ruptured in 1833, and consist of distinct asperities within a patch of the megathrust that had remained locked in the interseismic period. This indicates that the same portion of a megathrust can rupture in different patterns depending on whether asperities break as isolated seismic events or cooperate to produce a larger rupture. This variability probably arises from the influence of non-permanent barriers, zones with locally lower pre-stress due to the past earthquakes. The stress state on the portion of the Sunda megathrust that had ruptured in 1833 and 1797 was probably not adequate for the development of a single major large rupture in

show abstract

mentioning

confidence: 92%

Partial rupture of a locked patch of the Sumatra megathrust during the 2007 earthquake sequence

Konca

Avouac

Sladen

et al. 2008

Nature

323

369

View full text Add to dashboard Cite

show abstract

“…And this problem is relevant not only for the Parkfield sequence. Other earthquake sequences are also similarly short (e.g., Okada et al, 2003;Park and Mori, 2007). Studying sequences of smaller events also has intrinsic difficulties.…”

Section: Parkfield Sequencementioning

confidence: 99%

Recurrent frequency-size distribution of characteristic events

Abaimov

Tiampo

Turcotte

et al. 2009

Nonlin. Processes Geophys.

View full text Add to dashboard Cite

Abstract. Statistical frequency-size (frequency-magnitude) properties of earthquake occurrence play an important role in seismic hazard assessments. The behavior of earthquakes is represented by two different statistics: interoccurrent behavior in a region and recurrent behavior at a given point on a fault (or at a given fault). The interoccurrent frequencysize behavior has been investigated by many authors and generally obeys the power-law Gutenberg-Richter distribution to a good approximation. It is expected that the recurrent frequency-size behavior should obey different statistics. However, this problem has received little attention because historic earthquake sequences do not contain enough events to reconstruct the necessary statistics. To overcome this lack of data, this paper investigates the recurrent frequencysize behavior for several problems. First, the sequences of creep events on a creeping section of the San Andreas fault are investigated. The applicability of the Brownian passage-time, lognormal, and Weibull distributions to the recurrent frequency-size statistics of slip events is tested and the Weibull distribution is found to be the best-fit distribution. To verify this result the behaviors of numerical sliderblock and sand-pile models are investigated and the Weibull distribution is confirmed as the applicable distribution for these models as well. Exponents β of the best-fit Weibull distributions for the observed creep event sequences and for the slider-block model are found to have similar values ranging from 1.6 to 2.2 with the corresponding aperiodicities C V of the applied distribution ranging from 0.47 to 0.64. We also note similarities between recurrent time-interval statistics and recurrent frequency-size statistics.

show abstract

“…The source characteristics of the 2009 Irian Jaya earthquake doublet are very similar to the Solomon Islands doublets ( Fig. 1 and Table 1), as described by Lay and Kanamori (1980) and Park and Mori (2007). Lay and Kanamori (1980) first noted that large shallow earthquakes in the Solomon Islands and New Britain Islands regions tend to occur in closely related pairs.…”

Section: January 3 2009 22:43 Ut Eventmentioning

confidence: 60%

“…The New Britain and Solomon Islands regions located east of the Irian Jaya region are also well known for large shallow thrust events (M w > 7.0) that have tendency to occur in closely related pairs (Table 1). These earthquake doublets are represented by the similarly sized events that occur at nearly the same time and location (Lay and Kanamori, 1980;Schwartz et al, 1989;Park and Mori, 2007). Lay and Kanamori (1980) reported that such a doublet behavior is a true characteristic of the regions due to the complex tectonic settings.…”

Section: Introductionmentioning

confidence: 99%

Source processes of the 2009 Irian Jaya, Indonesia, earthquake doublet

Poiata

Koketsu

2010

Earth Planet Sp

View full text Add to dashboard Cite

, an earthquake doublet with moment magnitudes of 7.6 and 7.4 occurred along the New Guinea trench near the northern coast of Irian Jaya, Indonesia. The events were separated by three hours in time and 60 km in space, having similar thrust faulting mechanisms. The Solomon and New Britain Islands regions located east of the source area are well known for the occurrence of earthquake doublets due to the complex tectonic settings. To investigate the source processes of the earthquake doublet, we have performed teleseismic waveform inversions using P-wave displacement records from the IRIS-DMC database. The results of the inversions are consistent with the direction of the subduction along the New Guinea trench for both of the earthquakes. Significant slips exceeding 5.0 m appear near the hypocenters, and the slip distributions look to be complementary to each other. The rupture starting point of the second event is close to the edge of the slip distribution of the first event. Our source models support the triggering mechanism of doublet events suggested by Lay and Kanamori (1980). The results also suggest the state of stress in the Irian Jaya region and the mechanism of earthquakes in this subduction zone.

show abstract

Are asperity patterns persistent? Implication from large earthquakes in Papua New Guinea

Cited by 33 publications

References 22 publications

Partial rupture of a locked patch of the Sumatra megathrust during the 2007 earthquake sequence

Partial rupture of a locked patch of the Sumatra megathrust during the 2007 earthquake sequence

Recurrent frequency-size distribution of characteristic events

Source processes of the 2009 Irian Jaya, Indonesia, earthquake doublet

Contact Info

Product

Resources

About