During the last years, several investigations on the earthquakes and related tectonic structures along the Java trench have been conducted. In this study, we focus on the Lombok Island -West Nusa Tenggara (Indonesia), which lies between the centres of the highest intensity of contiguous negative-positive geomagnetic anomalies in this region. The geological and tectonic structures, however, are not known in detail for this island, whereas a better knowledge of these conditions could lead to better estimate the potential earthquake risks and thus a possible improvement of the existing early warning system.We have performed a ground-based geomagnetic survey at 56 stations in the Lombok Island during October-November 2006 for a detailed mapping and interpretation of geomagnetic anomalies related to the geological and tectonic characteristics. The 2D and 3D magnetic maps show a general geomagnetic anomaly pattern in the Lombok Island which consists of repeated contiguous negative-positive anomalies. Two forward models have been proposed for a profile connecting a strongest apparent dipolar structure. The first model assumes a uniformly magnetized sphere as the source of the anomaly, and could be interpreted as a specific local structure composed by a quite large magnetic body. The second model considers several rocks with different susceptibilities and magnetizations, and could be interpreted as a discontinuity in the geological structures. This model agrees with the local geological surface conditions and the known large scale regional tectonic structure. Therefore, it is used to interpret our results in terms of tectonic characteristics, which suggests the potential existence of a new tectonic element (e.g. a local normal fault) in this region.
Penelitian ini bertujuan untuk mendeskripsikan konsep pembelajaran matematika berdasarkan teori jean piaget pada tingkat sekolah dasar. Adapun fokus utama dalam penelitian ini yaitu bagaimana perkembangan kognitif anak dalam pembelajaran matematika berdasarkan teori jean piaget pada tingkat sekolah dasar. Alat penelitian yang digunakan dalam penelitian ini adalah peneliti itu sendiri sebagai instrumen utama. Penelitian ini menggunakan jenis penelitian studi kepustakaan, yaitu penelitian yang objeknya berupa buku, jurnal, artikel dan karya ilmiah lainnya. Teknik pengumpulan data pada penelitian ini berupa wawancara dan dokumentasi. Analisis data menggunakan content analysis. Hasil penelitian menunjukkan bahwa tingkat kognitif anak dalam pembelajaran matematika memiliki perbedaan pada tahapan usianya. Perkembangan anak dalam tahapannya mampu mengubah perspektif anak akan pentingnya ilmu pengetahuan dan cara belajarnya. Adapun faktor lain yang mempengaruhi kognitif anak yaitu penggunaan model, metode, dan variasi belajar yang disajikan sesuai tingkat usai anak. Oleh karena itu dengan adanya pendekatan kognitif bisa menjadi landasan bagi pendidik untuk melaksanakan kegiatan belajar mengajar sehingga proses pembelajaran menjadi efektif, efesien, dan tujuan tercapai.
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