Preliminary result of teleseismic double-difference relocation of earthquakes in the Molucca collision zone with a 3D velocity model

Shiddiqi, Hasbi Ash; Widiyantoro, Sri; Nugraha, Andri Dian; Ramdhan, Mohamad; Wandono,; Sutiyono,; Handayani, Titi; Nugroho, Hendro

doi:10.1063/1.4915019

Cited by 5 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The problem faced in this study is on fault data that is suspected of being active in the West Halmahera area, however, the characteristics and parameters are unknown. Based on Shiddiqi et al (2015) that it is necessary to do further studies to obtain data and parameters specifically the geology for the West Halmahera region.…”

Section: Data Processing and Analysismentioning

confidence: 99%

See 1 more Smart Citation

Mapping of PGA Value Using PSA Method in West Halmahera Nort Maluku

et al. 2020

View full text Add to dashboard Cite

The earthquake that occurred in the West Halmahera region was very detrimental, even though the human casualties were not very significant. But it will affect the stability and capacity of a region in terms of regional development. The mapping of earthquake-prone areas is carried out by a probabilistic seismic hazard analysis (PSHA) method to analyze soil movement parameters, namely Peak Ground Acceleration so that it can determine earthquake-prone areas in West Halmahera. The results of seismic hazard analysis show that the West Halmahera area is an area that is relatively prone to earthquake hazards because it is still strongly influenced by subduction (megathrust) earthquakes from the Philippine plate, Maluku sea and Sangihe. This is indicated by the value of earthquake acceleration on the Peak Ground Acceleration for the 500 year return period of around 0.38 - 3.69 g and 0.30 - 3.69 g for the 2500 year return period.

show abstract

Section: Data Processing and Analysismentioning

confidence: 99%

“…Shallow earthquakes in the Maluku plate are associated with collisions of the Halmahera arc and other deformation processes. The crossbow collision forms the Maluku collision zone with unique and complex tectonics (Shiddiqi et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Mapping of PGA Value Using PSA Method in West Halmahera Nort Maluku

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The latest finding, based on GPS observation of the Mw 7.1 Molucca Sea earthquake on November 14, 2014, Gunawan et al (2016) suggests that the earthquake caused a coseismic slip of ± 36 cm around the hypocenter located in the central ridge. In other previous seismic studies conducted in the Molucca Sea, hypocenter relocation was investigated to enhance the location accuracy of earthquake events (Nugraha et al 2015;Shiddiqi et al 2015;Yulianto et al 2017;Supendi et al 2020). These studies apply the double-difference method, where the distance of two events is smaller than the distances to measuring stations, implying that they have similar ray paths (Waldhauser and Ellsworth 2000).…”

Section: Introductionmentioning

confidence: 99%

Local seismotectonic analysis of the July 2019 Molucca Sea earthquake sequence based on moment tensor solutions

et al. 2021

View full text Add to dashboard Cite

We investigate the local seismotectonic of the Molucca Sea area using moment tensor calculations for the earthquakes that occurred in July 2019 at a depth of 10–55 km. The mainshock of Mw 6.8 occurred on July 7, followed by aftershocks until July 18, with magnitudes ranging from Mw 4.6 to Mw 5.8. Moment tensor solutions are calculated by applying Isolated Asperities (ISOLA) software using the full waveform data recorded at regional seismic stations. The analyzed frequency bands used in this study are 0.01–0.03 Hz and 0.04–0.05 Hz for the event with Mw ≥ 5 and Mw < 5, respectively. We provide validations of new moment tensor solutions for Mw < 5 events in the Molucca Sea region for the period during the earthquake sequence. The results show that thrust and oblique faults are dominant during this event, which indicate a compressional stress of divergent double subduction (DDS) of the Sangihe and Halmahera arcs. Only one full moment tensor solution reveals the normal fault mechanism, which may indicate the manifestation of strain release of compressional stress in the surrounding area. Furthermore, these results also support the previous studies suggesting that the Talaud-Mayu Ridge located in the middle of the Molucca Sea has developed as a consequence of the transpressional tectonic activity.

show abstract

The Possibly of the November-December 2018 earthquakes caused by hydrothermal in the Mamasa and surrounding areas derived by the earthquake relocation data

Ali

Rosid

Ramdhan

2020

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

During the last two months in 2018, 761 earthquakes occur in Mamasa Region, west Celebes. These earthquakes are not lying in known active faults in Celebes and not have mainshock. About 287 earthquakes felt by local society. Mapping for detailed seismicity in this region is crucial to know the source of this earthquake sequence. The Inversion from arrival time catalog was performed to derive the 1-D local velocity model. The initial velocity model is obtained by combining ak135 for spherical average structure and local velocity model in Palu Koro Region that has been studied previously. The new local velocity model was used to compute double-difference relocation, while data input was arrival time catalog from Meteorological Climatological and geophysical agency. We successfully relocate 752 earthquakes with fine residual value 0 until 0.032 seconds. The trend of this earthquake sequence was spread but the main linearization is N 80 W, but it still makes a trend from a 48-degree dip angle. With the number of earthquakes in a narrow area and shallow depth within a short period of time, it should be suspected that there is a contact between faults and hot springs in the area so that these earthquakes can occur.

show abstract

Preliminary result of teleseismic double-difference relocation of earthquakes in the Molucca collision zone with a 3D velocity model

Cited by 5 publications

References 12 publications

Mapping of PGA Value Using PSA Method in West Halmahera Nort Maluku

Mapping of PGA Value Using PSA Method in West Halmahera Nort Maluku

Local seismotectonic analysis of the July 2019 Molucca Sea earthquake sequence based on moment tensor solutions

The Possibly of the November-December 2018 earthquakes caused by hydrothermal in the Mamasa and surrounding areas derived by the earthquake relocation data

Contact Info

Product

Resources

About