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The construction of the Banda Aceh Wastewater Treatment Plant has been delayed due to the discovery of archaeological artifacts in the construction area. In an effort to protect the existence of archaeological artifacts, a survey using the magnetic method was carried out to identify the distribution of archaeological artifacts. Total magnetic field intensity data were measured using the Proton Precession Magnetometer (PPM) equipment. The measuring area is 38 m × 40 m with 1599 measurement points and the distance between the points is 1 m. Total magnetic field anomaly values were obtained through the diurnal and International Geomagnetic Reference Field (IGRF) corrections. The maximum values of the total magnetic field anomaly are 71.0 nT and the minimum values are -99.5 nT. The maximum and minimum values are close to where the artifacts have been exposed. To obtain the distribution of anomalies, analysis signal processes were performed. The results succeeded in showing the existence of archaeological artifacts based on elongated and closed anomalies. Elongated anomalies were identified as a fence structure called diwai in Acehnese culture and the closure anomalies were identified as gravestones. The existence of these archaeological artifacts and their historical values need to be preserved so that they will be educational facilities and historical tourism objects for the community. [ABSTRACT FROM AUTHOR]

Investigation of sediments carried by tsunami 2004 was conducted in Seungko Meulat village, located in Lhoong subdistrict of Great Aceh, Aceh province, Indonesia. Seungko Meulat is directly opposite the Indian Ocean thus it is probable to be affected by the giant tsunami that has hit Aceh province. The deposit samples were taken at two points using a hand drill with a depth of over 1 meter. The collected samples have been further prepared in the laboratory including cleaning, refining, and sieving. Based on our visual observations, the 2004 tsunami candidate layer was found in our study. Tsunami deposits were identified at a depth of 4 cm with a thickness of 16-24 cm. The layers are characterized by light brown coarse to fine sand material located above a dark brown paleosoil layer with sharp erosion contacts. The tsunami deposits of coarse size at the bottom gradually turn into medium to fine sand at the upmost layer. The finer grain size of sand material reflects weakened tsunami waves in the pre-backwash deposition. Moreover, the lower part of the tsunami deposition layer is rich in plant roots, stems, and anthropogenic products. Based on the results obtained, the tsunami layers found in this study have characteristics that are almost similar to the tsunami layer found in other areas. [ABSTRACT FROM AUTHOR]