Resilience-Focused Journalism: The Motivations, Tactics, and Impact of the Los Angeles Times Coverage of Earthquake Risk

As disasters and climate change threaten more and more people around the world, it is increasingly important for communities to adopt resilience policies. However, despite considerable benefits and the high probability of a return on investment, resilience policies are often neglected. In this article, we examine the agenda setting campaign by the Los Angeles Times that helped create the conditions for mandatory retrofitting ordinances to succeed where previous attempts failed. Through in-depth interviews with journalists and editors at the Times, and policymakers involved in the debate, we illustrate the motivations, tactics, and impact of their coverage of earthquake risk in Southern California. The article contributes to the understanding of agenda setting, risk communication, and local news production by demonstrating why and how journalists can effectively communicate risks and enable policy change, which could apply to a range of environmental threats

How Development Affects News Media Coverage of Earthquakes: Implications for Disaster Risk Reduction in Observing Communities

Previous research suggests that lesson-drawing news coverage of disasters can create windows of opportunity for policy learning in the observing communities. This is especially important for cities facing similar vulnerabilities to disaster-affected communities, where they can learn from their events to pursue disaster risk reduction policies to mitigate against those risks at home. However, little is known about the conditions under which newspapers in at-risk communities provide the type of news coverage necessary for policy learning. Using logistic regression to analyze an original dataset produced from a content analysis of five newspapers’ coverage of five earthquakes, we demonstrate that the level of development of the disaster-stricken community systematically influences the nature of news coverage in at-risk communities. These results have important implications for the understanding of urban disaster risk reduction, suggesting that the conditions for bottom-up policy learning are more likely to occur following disasters in wealthier countries

Agenda Setting, Localization and the Third-Person Effect: An Experimental Study of When News Content Will Directly Influence Public Policy Demands

Building from the third-person effect model of DRR policy adoption and mediated policy learning, this study provides an experimental examination of how specific elements of news media’s localisation of distant events directly influence public opinion. Controlling for salience effects, the construction of affinities between the distant, stricken community and the newspaper’s audience is argued to create a sense of shared vulnerability to the reported disasters. This is correlated within an increase in the respondent’s intention to act directly and an increase in their willingness to punish elected officials who do not act accordingly. The construction of difference between the communities, even though it is not related to risks related to the disaster, is argued to create implicit reassurances that the observing community does not need to act. This leads to an increased intention to act directly in opposition to efforts to reduce risk, but a neutral response towards political actors who pursue risk reduction policy actions

Stellar Diameters and Temperatures. I. Main-Sequence A, F, and G Stars

We have executed a survey of nearby, main-sequence A-, F-, and G-type stars with the CHARA Array, successfully measuring the angular diameters of forty-four stars with an average precision of ~1.5%. We present new measures of the bolometric flux, which in turn leads to an empirical determination of the effective temperature for the stars observed. In addition, these CHARA-determined temperatures, radii, and luminosities are fit to Yonsei-Yale model isochrones to constrain the masses and ages of the stars. These results are compared to indirect estimates of these quantities obtained by collecting photometry of the stars and applying them to model atmospheres and evolutionary isochrones. We find that for most cases, the models overestimate the effective temperature by ~1.5%-4% when compared to our directly measured values. The overestimated temperatures and underestimated radii in these works appear to cause an additional offset in the star's surface gravity measurements, which consequently yield higher masses and younger ages, in particular for stars with masses greater than ~1.3 M_☉. Additionally, we compare our measurements to a large sample of eclipsing binary stars, and excellent agreement is seen within both data sets. Finally, we present temperature relations with respect to (B – V) and (V – K) colors as well as spectral type, showing that calibration of effective temperatures with errors ~1% is now possible from interferometric angular diameters of stars

Stellar Diameters and Temperatures II. Main Sequence K & M Stars

We present interferometric diameter measurements of 21 K- and M- dwarfs made with the CHARA Array. This sample is enhanced by literature radii measurements to form a data set of 33 K-M dwarfs with diameters measured to better than 5%. For all 33 stars, we compute absolute luminosities, linear radii, and effective temperatures (Teff). We develop empirical relations for \simK0 to M4 main- sequence stars between the stellar Teff, radius, and luminosity to broad-band color indices and metallicity. These relations are valid for metallicities between [Fe/H] = -0.5 and +0.1 dex, and are accurate to ~2%, ~5%, and ~4% for Teff, radius, and luminosity, respectively. Our results show that it is necessary to use metallicity dependent transformations to convert colors into stellar Teffs, radii, and luminosities. We find no sensitivity to metallicity on relations between global stellar properties, e.g., Teff-radius and Teff-luminosity. Robust examinations of single star Teffs and radii compared to evolutionary model predictions on the luminosity-Teff and luminosity-radius planes reveals that models overestimate the Teffs of stars with Teff < 5000 K by ~3%, and underestimate the radii of stars with radii < 0.7 R\odot by ~5%. These conclusions additionally suggest that the models overestimate the effects that the stellar metallicity may have on the astrophysical properties of an object. By comparing the interferometrically measured radii for single stars to those of eclipsing binaries, we find that single and binary star radii are consistent. However, the literature Teffs for binary stars are systematically lower compared to Teffs of single stars by ~ 200 to 300 K. Lastly, we present a empirically determined HR diagram for a total of 74 nearby, main-sequence, A- to M-type stars, and define regions of habitability for the potential existence of sub-stellar mass companions in each system. [abridged]Comment: 73 pages, 12 Tables, 18 Figures. Accepted for publication in The Astrophysical Journa

Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations

Based on CHARA Array measurements, we present the angular diameters of 23 nearby, main-sequence stars, ranging from spectral types A7 to K0, 5 of which are exoplanet host stars. We derive linear radii, effective temperatures, and absolute luminosities of the stars using Hipparcos parallaxes and measured bolometric fluxes. The new data are combined with previously published values to create an Angular Diameter Anthology of measured angular diameters to main-sequence stars (luminosity classes V and IV). This compilation consists of 125 stars with diameter uncertainties of less than 5%, ranging in spectral types from A to M. The large quantity of empirical data is used to derive color-temperature relations to an assortment of color indices in the Johnson (BVR_(J)I_(J)JHK), Cousins (R_(C)I_(C)), Kron (R_(K)I_(K)), Sloan (griz), and WISE (W_(3)W_(4)) photometric systems. These relations have an average standard deviation of ~3% and are valid for stars with spectral types A0-M4. To derive even more accurate relations for Sun-like stars, we also determined these temperature relations omitting early-type stars (T_eff > 6750 K) that may have biased luminosity estimates because of rapid rotation; for this subset the dispersion is only ~2.5%. We find effective temperatures in agreement within a couple of percent for the interferometrically characterized sample of main-sequence stars compared to those derived via the infrared flux method and spectroscopic analysis

Angular Diameters of the Hyades Giants Measured with the CHARA Array

We present angular diameters of the Hyades giants, gamma, delta^1, epsilon, and theta^1 Tau from interferometric measurements with the CHARA Array. Our errors in the limb-darkened angular diameters for these stars are all less than 2%, and in combination with additional observable quantities, we determine the effective temperatures, linear radii and absolute luminosities for each of these stars. Additionally, stellar masses are inferred from model isochrones to determine the surface gravities. These data show that a new calibration of effective temperatures with errors well under 100K is now possible from interferometric angular diameters of stars.Comment: Accepted for publication in The Astrophysical Journa

Erratum: “stellar diameters and temperatures. II. main-sequence K- and M-stars” (2012, ApJ, 757, 112)

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