Seismic Noise Characteristics at the Romanian Broadband Seismic Network

The noise level of the Romanian broadband stations operating since 2006 has been studied in order to identify the variations in background seismic noise as a function of time of day, season, and particular conditions at the stations. Power spectral densities and their corresponding probability density functions are used in this paper to characterize the background seismic noise. At high frequencies (> 1 Hz), seismic noise seems to have cultural origin, since significant variations (up to 55 dB) between daytime and nighttime noise levels are observed at almost all of the stations. However, this variability appears not to influence the detection capabilities of the Romanian Seismic Network in case of intermediate-depth earthquakes and earthquakes with magnitude over 3.0. For smaller magnitude events (Mw < 3), we showed that the number of stations detecting an event decreases during daytime. We studied the seasonal variation of the seismic noise for primary and secondary microseisms (with emphasize for the latter) and we demonstrated that the noise levels are higher in winter than in summer. We also observed a shift of the double-frequency peak from lower periods in summer to longer periods in winter. The polarization analysis indicated that the main sources of secondary microseisms for stations close to the Black Sea are coming from the Black Sea, while for the others the main sources are found in the Mediterranean Sea and Atlantic Ocean. Finally, the analysis of the probability density functions for stations located in different geologic conditions has pointed out that the noise level is higher for stations sited on softer formations than those sited on hard rocks.     

The Ḥanbalī Emigration of 551–569 AH/1156–1173 AD in the Context of the Legal Discourse on Muslims under Non‐Muslim Rule

In 551 AH/1156 AD the ?anbalī shaykh A?mad ibn Qudāma (491–558/1098–1163) emigrated from the Frankish‐ruled region of Samaria. He reached Damascus and advised his relatives to follow suit, thus initiating the two‐decade exodus of the Banū Qudāma from the Latin Kingdom of Jerusalem. The migration story survives in a tenth/sixteenth century chronicle and is attributed to A?mad's grandson, ?iyā’ al‐Dīn (569–643/1173–1245). According to ?iyā’ al‐Dīn, the cause of the emigration was the extreme oppression of the local Frankish lord, Baldwin of Ibelin (d. c. 582/1186), and A?mad ibn Qudāma's inability to practice his religion. But scholars have also attributed the emigration to wider ideological and political developments under the reign of Nūr al‐Dīn ibn Zengi (541–569/1146–1174), namely the counter‐crusade and the institutionalization of jihad propaganda. Here I explore the context of the emigration in greater detail while focusing primarily on legal theory. In most cases, a historian can determine the circumstances that led to the issuance of certain legal opinions but in the case of the ?anbalī emigration we have an event without an accompanying legal opinion. Accordingly, the emigration must be analyzed in light of developments in ?anbalī legal thought prior to and during the crusades and in consideration of how members of the Banū Qudāma perceived their role prior to and during the emigration. A?mad's role as a charismatic shaykh and spiritual leader became ever more critical and contentious at a time when political tensions between Franks and Muslims were escalating. Furthermore, the heightened religiosity of the Muslims of Greater Syria inspired other members of the Qudāma family to leave the Frankish domains even though their lives were not in danger. This chapter thus aims to complement Steven Gertz's analysis of legal opinions on the obligation to emigrate (The Muslim World , vol. 103) by providing a grounded example of how such opinions could be enacted.     

Princely longing for Europe: Constantine II Brâncoveanu's Mogoşoaia Palace (1702) and the creation of a European identity

Trapped among the Austrian, Russian and Ottoman empires, the reign of Constantin II Brancoveanu, Prince of Wallachia, was a constant balancing act between the West and the East. To further his political and cultural ambitions, Constantin initiated and supported an artistic movement, known today as the Brancovenesc style, of which his residence, the Mogosoaia Palace, stands as a prime example. The architecture and ornamentation of the palace makes use of elements from both Eastern – Byzantine and Ottoman – and Western – Renaissance and Baroque – European artistic traditions, merging them into an organic whole. The aim of this article is to explore the artistic strategies employed throughout the palace by arguing that they explicitly, as well as implicitly, construct an inclusive European identity. Starting from the premise that the palace acted as a place of cultural encounter between the East and West, the analysis will focus on how the decoration implies a space of transition through subjects such as metamorphosis and the double-headed eagle. Also, the importance given to spaces such as the entrance foyer and loggia suggests their role as critical spaces evoking the ambiguous concept of the parergon, which in turn challenges the emerging Enlightenment idea of the West as properEurope and the East as not quite Europe.     

The application of the tree-ring chronologies in assessing ecological requirements of Metasequoia glyptostroboides growing in southern Poland

Metasequoia glyptostroboides is considered to be a species highly resistant to harmful environmental factors. For this reason it has been introduced to the cities. The climate of Krakow differs from that in its natural range in China. The research was focused on 40-year-old trees, planted in Kraków on fertile alluvial soils with a low level of ground water, in the vicinity of the steelworks. During the period of the highest level of air pollution in the 1970s and 1980s, the radial increment of investigated trees showed an increasing trend. At the end of the 1980s, when the emissions were reduced, a decreasing trend in radial growth was recorded. Throughout the entire period of their life the investi-gated trees have shown high homogeneity of short-term growth reactions. The sensitivity chronology of the trees was characterized by a high representativeness and a strong high-frequency signal. This may indicate that the investigated trees have shown a large sensitivity to climatic factors. The positive effect on the radial growth of Metasequoia had a cold September in the previous year, and also a cold January, April and May in the year of ring formation. Positive impact on the growth of trees had also the high precipitation occurring in April and August, as well as high air humidity in the spring of the year of ring formation. In the period 1974–2011 fifteen signature years were found. The analysis of the climatic conditions in these years confirms the results of the statistical analyses.