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The 30 October 2020 (11:51 Utc) Izmir-Samos Earthquake and Tsunami; Post-Tsunami Field Survey Preliminary Results

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The 30 October 2020 (11:51 Utc) Izmir-Samos Earthquake and Tsunami; Post-Tsunami Field Survey Preliminary Results THE 30 OCTOBER 2020 (11:51 UTC) IZMIR-SAMOS EARTHQUAKE AND TSUNAMI; POST-TSUNAMI FIELD SURVEY PRELIMINARY RESULTS Ahmet Cevdet Yalcinera, Gozde Guney Dogana, Ergin Ulutaşb, Orhan Polatc, d d d Ahmet Tarih , Evrens Rıza Yapar , Evrim Yavuz aMiddle East Technical University, Department of Civil Engineering, Ocean Engineering Research Center, Turkey b Kocaeli University, Department of Geophysical Engineering, Seismology Division, Turkey cDokuz Eylul University, Department of Geophysical Engineering, Seismology Division, Turkey dIstanbul Metropolitan Municipality, Directorate of Earthquake and Ground Investigation Correspondence: [email protected] and [email protected] November 03, 2020 TABLE OF CONTENTS ABSTRACT ......................................................................................................................... 1 1. INTRODUCTION .......................................................................................................... 2 2. FIELD OBSERVATIONS ON TSUNAMI SUMMARY ......................................................... 3 2.1. FIELD OBSERVATIONS IN ALACATI AND ZEYTINELI REGION ...................................... 6 2.1.1 Zeytineli Locality ......................................................................................................... 7 2.1.2 Alacati Locality ........................................................................................................... 9 2.2. FIELD OBSERVATIONS IN DEMIRCILI AND ALTINKOY REGION ................................. 12 2.2.1 Demircili Locality ...................................................................................................... 12 2.2.2 Altinkoy Locality ....................................................................................................... 15 2.3. FIELD OBSERVATIONS IN SIGACIK AND AKARCA REGION ....................................... 15 2.3.1 Sigacik Locality ......................................................................................................... 15 2.3.2 Akarca Locality ......................................................................................................... 21 2.4. FIELD OBSERVATIONS IN TEPECIK AND GUMULDUR REGION ................................. 25 2.4.1 Tepecik Locality ........................................................................................................ 25 2.4.2 Gumuldur Locality .................................................................................................... 26 3. DISCUSSIONS AND CONCLUSIONS ............................................................................ 27 4. ACKNOWLEDGEMENTS ............................................................................................ 28 LIST OF FIGURES AND TABLES Figure 1.1 Bathymetric map around Kusadasi, Sigacik Bays and Samos Island ...................................... 2 Figure 2.1 Post-tsunami field survey area where observations of tsunami waves were obtained from locals, debris or traces identified ............................................................................................................ 3 Figure 2.2 Location map showing the distribution of the observations of the tsunami waves, obtained from locals, debris or traces identified in Zeytineli (Urla) and Alacati (Cesme) towns of Izmir city, Turkey ................................................................................................................................................................. 6 Figure 2.3 View of the stream bed (green line) and the tsunami inundation zone (blue line) as of GPS records for Zeytineli. Main roads (black line) are located at the E and W part of the valley heights. Gray lines denote track records. ...................................................................................................................... 7 i Figure 2.4 View of the stream bed and the tsunami inundation zone in Zeytineli (photo view from E to W) ............................................................................................................................................................ 7 Figure 2.5: (Left) Wave traces on the palm tree (1.90 m) near the coastline (N38.19600 E26.48859), and (Right) trace of debris materials accumulated at the outer wall (1.50 m) of a house (N38.19587 E26.49027 and N38.19587 E26.49027, respectively) .............................................................................. 8 Figure 2.6 Damage observation in the fisher shelter (N38.19336 E26.49233), and rescue operation of a car which was dragged into due to tsunami ........................................................................................ 9 Figure 2.7 View of the stream bed (green line) and the tsunami inundation zone (blue line) as of GPS records for Alacati. Gray lines denote track records ............................................................................... 9 Figure 2.8 View of the stream bed and the tsunami inundation zone in Alacati (photo view from W to E). Alacati fisher shelter is 1.1 km far from the boat and slightly visible at the right extremity of the photo ..................................................................................................................................................... 10 Figure 2.9 Fisher boat on Alacati Azmak is dragged 430 m away from the shoreline (at 14:22 Local Time on 31 October 2020) ............................................................................................................................. 10 Figure 2.10 Water level increase at the garden wall of Alacati Port Houses according to house owner (N38.26370 E26.37427) ......................................................................................................................... 11 Figure 2.11 (Top) Wave trace was visible on Alacati Azmak bridge (~30 cm height from the bottom of the bridge wall) located at the North, 1.0 km away from the coastline (N38.27061 E26.37684), and (Bottom) near the Izmir-Cesme highway viaduct. Looking directions are from N to S for the top, and reverse for the bottom pictures ............................................................................................................ 12 Figure 2.12 Demircili locality, small inundation in the Northwestern part ........................................... 13 Figure 2.13 Demircili Beach, highly damaged boats ............................................................................. 14 Figure 2.14 Denizkizi Beach inundation extent ..................................................................................... 14 Figure 2.15 Inundated areas in Altinkoy ............................................................................................... 15 Figure 2.16 Summary of tsunami parameters measured in Sigacik ...................................................... 16 Figure 2.17 Photo of Teos Marina before the event taken on 07.09.2020 ........................................... 16 Figure 2.18 Photo of Teos Marina after the event taken from a local newspaper (https://www.sabah.com.tr/video/yasam/depremin-merkez-ussu-seferisar-sigaciktaki-tsunami- felaketi-havadan-boyle-goruntulendi-video) ........................................................................................ 17 Figure 2.19 Photo of Teos Marina after the event taken by a drone .................................................... 17 Figure 2.20 Tsunami traces on the garden fence of Teos Marina ......................................................... 18 Figure 2.21 Azmak river in the East direction from Teos Marina where the tsunami overflowed the small bridge ........................................................................................................................................... 19 Figure 2.22 Dragged paddleboat in Sigacik ........................................................................................... 20 ii Figure 2.23 Damage and tsunami traces in cafes and shops in Sigacik ................................................. 20 Figure 2.24 The white house damaged due to tsunami at 38.195600N 26.787424E ........................... 21 Figure 2.25 Surveyed locations in Akarca .............................................................................................. 22 Figure 2.26 Damaged fishery port piers, boats and small structures in Akarca due to tsunami .......... 22 Figure 2.27 Dragged boat in Akarca ...................................................................................................... 23 Figure 2.28 The white house where 1.9 m splash height was measured in Akarca ............................. 23 Figure 2.29 Tsunami damage in Seferihisar Diving Center located in Akarca region ............................ 24 Figure 2.30 Tsunami inundation near Seferihisar Diving Center ........................................................... 24 Figure 2.31 Surveyed locations in Tepecik locality ................................................................................ 25 Figure 2.32 Tsunami inundation along a stream in Orsal Bay in Tepecik locality ................................. 26 Figure 2.33 Surveyed locations in Gumuldur region ............................................................................. 26 Figure 2.34 25 m inundation in Gumuldur ............................................................................................ 27 iii FOREWORD Tsunamis leave different types of traces in the inundation zone after the event. These traces may disappear in a short time because of natural processes and human activities. Therefore, quick
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