scholarly journals Cratering asymmetry on the Moon: New insight from the Apollo Passive Seismic Experiment

2011 ◽  
Vol 38 (15) ◽  
Author(s):  
Taichi Kawamura ◽  
Tomokatsu Morota ◽  
Naoki Kobayashi ◽  
Satoshi Tanaka
Keyword(s):  
The Moon ◽  
Seismic Experiment ◽  
Passive Seismic ◽  
Passive Seismic Experiment

scholarly journals Lunar Tidal Phenomena and the Lunar Rille System

1972 ◽  
Vol 47 ◽  
pp. 450-457
Author(s):  
Barbara M. Middlehurst
Keyword(s):  
Seismic Signals ◽  
The Moon ◽  
Small Areas ◽  
The Earth ◽  
Seismic Experiment ◽  
Passive Seismic ◽  
Colour Changes ◽  
Transient Events ◽  
Parallel Features ◽  
Passive Seismic Experiment

Two types of tide-linked lunar phenomena now exist: the so-called lunar transient events, short-lived changes in brightness or colour and obscurations in small areas of the Moon (the reported duration is typically from a few seconds to a few hours and the areas involved are usually a few kilometres or less in diameter); and the A- and B-type seismic signals relayed back from the Apollo 12 passive seismic experiment. The frequency diagrams of both the lunar transien t events and the seismic signals show strong peaks at perigee when the Earth is closest to the Moon, with a smaller peak at apogee (transient events and B-type signal only) and both have been attributed to endogenous causes.Both sets of data appear to be linked to areas where cracks and rilles exist. The most likely interpretation of the two sets of observations is that they are complementary and that some sort of gas release and excitation (in the cases of the glows and colour changes) is involved.Association of the lunar events with craters with seamed and cracked floors and with other crack systems is described. Only a few associated areas of the Moon-wide lineament systems have been noted, but the Apollo 12 seismometer signals seem likely to originate from the nearby system of parallel features in the Fra Mauro area. The case for possible gas volcanism is examined.

scholarly journals Moment magnitude estimates for Central Anatolian earthquakes using coda waves

2019 ◽  
Author(s):  
Tuna Eken
Keyword(s):  
Empirical Relation ◽  
Active Regions ◽  
Moment Magnitude ◽  
Central Anatolia ◽  
Coda Wave ◽  
Seismic Experiment ◽  
Tectonically Active ◽  
Passive Seismic ◽  
Passive Seismic Experiment ◽  
Good Agreement

Abstract. Proper estimate of moment magnitude that is a physical measure of the energy released at earthquake source is essential for better seismic hazard assessments in tectonically active regions. Here a coda wave modeling approach that enables the source displacement spectrum modeling of examined event was used to estimate moment magnitude of central Anatolia earthquakes. To achieve this aim, three component waveforms of local earthquakes with magnitudes 2.0 ≤ ML ≤ 5.2 recorded at 72 seismic stations which have been operated between 2013 and 2015 within the framework of the CD-CAT passive seismic experiment. An inversion on the coda wave traces of each selected single event in our database was performed in five different frequency bands between 0.75 and 12 Hz. Our resultant moment magnitudes (MW-coda) exhibit a good agreement with routinely reported local magnitude (ML) estimates for study area. Finally, we present an empirical relation between MW-coda and ML for central Anatolian earthquakes.

scholarly journals Passive seismic experiment and ScS wave splitting in the southwestern subbasin of South China Sea

2012 ◽  
Vol 57 (25) ◽  
pp. 3381-3390 ◽  
Author(s):  
AiGuo Ruan ◽  
JiaBiao Li ◽  
ChaoShing Lee ◽  
XueLin Qiu ◽  
ShaoJun Pan
Keyword(s):  
South China Sea ◽  
South China ◽  
China Sea ◽  
Seismic Experiment ◽  
Wave Splitting ◽  
Passive Seismic ◽  
Passive Seismic Experiment
Sign in / Sign up

Export Citation Format

Share Document