Long-period and broad-band teleseismic body-wave modeling of the October 18, 1989 Loma Prieta Earthquake

1990 ◽  
Vol 17 (9) ◽  
pp. 1409-1412 ◽  
Author(s):  
Jeffrey S. Barker ◽  
David H. Salzberg
Keyword(s):  
Body Wave ◽  
Broad Band ◽  
Wave Modeling ◽  
Loma Prieta Earthquake ◽  
Long Period ◽  
Loma Prieta

scholarly journals Assessment of the effects of local geology using long-period microtremors and the 1989 Loma Prieta earthquake motions

1992 ◽  
Author(s):  
Junpei Akamatsu ◽  
Masayuki Fujita ◽  
Hiroyuki Kameda ◽  
Mehmet Çelebi ◽  
R.D. Borcherdt
Keyword(s):  
Loma Prieta Earthquake ◽  
Long Period ◽  
Loma Prieta ◽  
Local Geology

scholarly journals Estimation of singly transiting K2 planet periods with Gaia parallaxes

2019 ◽  
Vol 489 (3) ◽  
pp. 3149-3161 ◽  
Author(s):  
Emily Sandford ◽  
Néstor Espinoza ◽  
Rafael Brahm ◽  
Andrés Jordán
Keyword(s):  
Direct Measurement ◽  
Free Parameter ◽  
Broad Band ◽  
Long Period ◽  
Period Distribution ◽  
Typical Period ◽  
Stellar Models ◽  
Host Stars ◽  
Stellar Density ◽  
As If

ABSTRACT When a planet is only observed to transit once, direct measurement of its period is impossible. It is possible, however, to constrain the periods of single transiters, and this is desirable as they are likely to represent the cold and far extremes of the planet population observed by any particular survey. Improving the accuracy with which the period of single transiters can be constrained is therefore critical to enhance the long-period planet yield of surveys. Here, we combine Gaia parallaxes with stellar models and broad-band photometry to estimate the stellar densities of K2 planet host stars, then use that stellar density information to model individual planet transits and infer the posterior period distribution. We show that the densities we infer are reliable by comparing with densities derived through asteroseismology, and apply our method to 27 validation planets of known (directly measured) period, treating each transit as if it were the only one, as well as to 12 true single transiters. When we treat eccentricity as a free parameter, we achieve a fractional period uncertainty over the true single transits of $94^{+87}_{-58}{{\ \rm per\ cent}}$, and when we fix e = 0, we achieve fractional period uncertainty $15^{+30}_{-6}{{\ \rm per\ cent}}$, a roughly threefold improvement over typical period uncertainties of previous studies.

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