URBAN SUBSIDENCE MONITORING BY SAR INTERFEROMETRY DATA IN KAZAKHSTAN REPUBLIC

URBAN SUBSIDENCE MONITORING BY SAR INTERFEROMETRY DATA IN

KAZAKHSTAN REPUBLIC

Zh. Zhantayev, B. Kurmanov, A. Bibossynov2, A. Fremd2, A. Ivanchukova2 12

1National Center of Space Researches and Technologies, Kazakhstan, Almaty 2LLP Institute of Ionosphere, Kazakhstan, Almaty

1. INTRODUCTION

In natural environment ground subsidence proceed slowly due the rocks compaction under pressure of overlying sediments. More intense motions over amplitude and time can be induced by human activity [1].

Observations revealed that the subsidence velocity and amplitude can reach significant values. At this rate, in Osaka some areas sedimentation rate reached 2.2 cm/year, in Mexico City - 24 cm/year, in Los Angeles - 75 cm/year, in Tallinn - 30 cm/year, in Riga - 3 cm/year, St. Petersburg - 1.5 mm/year, in Moscow - 3 mm/year [2].

2. STUDY AREA

Ground subsidence monitoring was developed for the two largest cities in Kazakhstan with different geological conditions – for the capital city Astana and for Almaty city.

Received the status of capital, Astana city began intensively build-up, realizing projects with complex architectural structures with participation of foreign experts. Located in the valleys between two rivers (Ishim and Nura), the expansion of the urban area required for the construction on a network of gully areas, wetlands and frequently flooded areas, areas previously soil covered on a river system (oxbow lakes, meanders). Was actively built-up the left bank of the Ishim River, the construction was carried out directly on the river terraces composed of loose sediments. Due to the construction of a new administrative and business center of the city area has expanded more than 700 km ² and the population have increased by 2.5 times by 2013, reaching 800 million people.

Almaty city is located on Quaternary alluvial fan and river deposits adjacent to a high mountain system in the south-east part of the country near the border with Kyrgyzstan and China. It is Kazakhstan’s largest city with population more than 1.7 million people. The city lies on a high dry (almost semi-desert) plain about 200-300 m above mean sea level at the foot of the picturesque Altay Mountains, which reach a maximum elevation of almost 7,000 m. A major fault zone bounds the Altay Mountains and presents a serious earthquake risk to the city.

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