Abstract
Mt. Jailolo is a B type volcano that has never erupted after 1600. Seismic activities around Mt. Jailolo have never been recorded until the swarm in November 2015. Several studies have been done to determine thecause of the swarm, but it is not certain whether the cause of the swarm is tectonic or volcanic activities. The study of attenuation characteristics has never been carried out in the area around Mt. Jailolo. Attenuation characteristics are important to provide the medium information which seismic waves pass through and it can also be applied to the volcanic areas as preliminary disaster mitigation. The main objective of this study is to analyze attenuation characteristics often expressed by Quality factor (Q-factor) of P and S seismic wave (Qα and Qβ), which are inversely proportional to attenuation factor (1/Q). Calculations of Qα and Qβ are obtained using coda normalization method. The study area location is around Mt. Jailolo at 127.3◦ - 127.6◦E and 0.9◦ - 1.2◦ N. Data have been collected with 12 Short Period temporary 7G sensors network belongs to GFZ and BMKG. This study uses 147 swarm events from the sensors with a threshold magnitude of Mw< 5.0, during April 2017. The study obtains Qα(f) = 9.61814f 1.12981 and Qβ(f) = 19.10690f 1.22843. The current analysis concludes that the attenuation beneath Mt. Jailolo corresponds to the volcanic swarms which may have been triggered by its deeper layer’s magmatic activity.
Highlights
The tectonic of Halmahera is affected by the double subduction of the Maluku Sea, which is a coalition area between the Halmahera Arc and the Sangihe Arc-North Sulawesi (Hamilton, 1979)
The complex tectonic conditions cause Halmahera Island to be included in an area with high seismicity activities
Halmahera Island is surrounded by many volcanoes, including Mt
Summary
The tectonic of Halmahera is affected by the double subduction of the Maluku Sea, which is a coalition area between the Halmahera Arc and the Sangihe Arc-North Sulawesi (Hamilton, 1979). The complex tectonic conditions cause Halmahera Island to be included in an area with high seismicity activities. Halmahera Island is surrounded by many volcanoes, including Mt. Jailolo which is located in the middle of the Halmahera volcanic arc. Mt. Jailolo is a B type volcano that has not yet experienced a magmatic eruption after 1600, but is having symptoms of activities such as solfatara. Jailolo is a B type volcano that has not yet experienced a magmatic eruption after 1600, but is having symptoms of activities such as solfatara Even though it has been categorized as an inactive volcano, this volcano has the potential to erupt. There are no further records of seismic activities around Mt. Jailolo for the period of 40 years until the swarm activities in November 2015 (Figure 1). Swarm activities have been dormant since February 2016, it has fluctuated again from 2017 to the present
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