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Prof. Dr. Ir. Djagal Wiseso Marseno, M.Agr

Vice Rector for Education, Learning and Students Affairs at Universitas Gadjah Mada

Founded in 1949 in the city of culture and education, Yogyakarta, Universitas Gadjah Mada (UGM) is the largest university in Indonesia and the best for several rankings. Our vision is to become a pioneer of superior and innovative worldclass university.

Institution’s service for the interests of the nation and humanity that inspires the nation’s cultural values, makes us continuously develop our learning programs and facilities. With the existing disciplines at UGM, students have several study programs that are very numerous and diverse. UGM also provides opportunities for students to enrich their knowledge, research experience and interdisciplinary approach at the campus.

As one of the oldest study programs in the Faculty of Mathematics and Natural Sciences of UGM, Geophysics presents a program that can direct students to actualize our vision and become a means of international publications as a form of UGM’s global research achievements. The event is the largest geophysical field lecture practice activity in Indonesia, where students will be intensively trained on how to explore energy resources based on earth science and physics concepts. In addition to educate and provide experience to students in real terms, there will also be various implementations of the environment that can support the welfare of the community around the research area. This is in accordance with the vision of the Universitas Gadjah Mada that is teaching, research, and community service.

As the Vice Rector for Education, Learning, and Student Affairs of UGM, I strongly support this event. All parties, both students, lecturers and academics are expected to work well together so that the purpose of this event can be achieved and become a place for research and science to develop and support the welfare of the country.

Regional Geology of Field Camp Location

The research area of ​​Tirtomoyo District is located in the zone fore arc basin of the subduction of the Australian and Eurasian plates in the south of Java Island. Physiographically, the Tirtomoyo area and its surroundings are included in the morphology of the relief hills in the Southern Java Mountains zone in the east, in the northern part of the Pacitan karst hills. Morphologically this area is influenced by the structure (folds, faults) and lithological properties. The geological structures that control this area are pure-shear forces with NS direction and forces with simple shear NW-SE directions which produce joints and faults. Stump extensions and two sliding faults (faults shear turn to the Kayulawang trending northwest – southeast and fault slide go to the left Kayulawang oriented southwest – northeast) is a geological structure that controls alteration and mineralization of ore. These two faults cause fractures which become channelways for hydrothermal fluids, resulting in hydrothermal alteration and deposition of ore mineralization in the fractures.

Propylitic (chlorite, epidote, and calcite) and argillic (smectite illite, and kaolinite) alteration are hydrothermal alteration zones that developed in Tirtomoyo. In the northern part of the study area, which has a large number of joints, the type of argillic alteration develops, while in the southern part of the study area, propylitic alteration develops.

The ore mineralization around Tirtomoyo District is in the form of quartz veins. The structures include vein swarms, low angle veins, and stockworks, with crustiform, comb, normal banded, and sacaroidal textures in the host rock, namely andesite lava. On microscopic analysis of the ore can be found gold, silver, galena, pyrite, chalcopyrite, sphalerite, chrysolite, and hematite, but gold and silver are not observed properly. Metal deposits in the southern mountains in the form of quartz veins are associated with sulphides. Magoscopic observations and mineragraphic analysis show that sphalerite dominates compared to galena. However, at certain depths, galena dominance can also be found.

 In the Geological Map sheet of Ponorogo, East Java (Sampurno et al., 1997) the research area of ​​Tirtomoyo District is located on the southwest side. The Regional Geological Conditions of the area consist of the following formations, from the oldest namely the Panggang Formation (Tomp), Semilir Formation (Tms), Nglanggran Formation (Tmn), Dacite Breakthrough Rock (Tmd), and the youngest is Alluvium.

The bedrock of this area is volcanic breccia of andesite and basalt lava, with sandstone inserts. The bottom mass of the tuffan breccia is generally chlorite and some of the lava is fractured. This formation is known as the Roast Formation. This formation is intertwined with the Watupatok Formation, thought to be Oligo-Miocene in age and formed in a marine environment. The spread of this formation is in the southeast of the research area. The thickness of the formation is not less than 200 meters.

Above the basement,was deposited inconsistently, the Semilir Formation which is a turbidite sequence dominated by pumice breccia and repetition of gravel sandstone, sandstone and claystone. The pumice breccia are composed of dacite and slightly andesite, basalt and sandstone with layers varying between 1-5 meters thick. Gravel sandstone and sandstone are composed of andesite, basalt, sandstone, and a little pumice with an average layer thickness of 75 cm. While claystone has a thickness of 30 cm. This formation is thought to be of Early Miocene age and formed in a deep-sea environment. The distribution of this formation is spread in the east and southeast as well as in the northwest and north of the study area. The thickness of this formation is more than 750 meters.

Above the Semilir Formation, the Nglanggran Formation is deposited in harmony, which is a series of volcanic rocks composed of andesite-basalt composed of volcanic breccias and sandstones. This formation is thought to be of Early Miocene age and formed in a terrestrial to transitional or shallow marine environment. The distribution of this formation is in the southeast and in the northwest and north of the study area. The thickness of this formation is about 500 meters.

 The Semilir Formation and Nglanggeran Formation were intruded by dacite intrusion rocks consisting of 30% plagioclase, 10% orthoclase, 10% biotite, 15% quartz, 5% hornblenda and 5% ore minerals in the microlithic base mass of plagioclase, quartz, and 25% altered minerals . The distribution of this formation is localized in the east, south and northwest research area.

At the very top there is Alluvium, which consists of gravel, gravel, sand, silt, and mud as river deposits. The distribution of this formation is longitudinal with a west-east orientation in the study area.

MASW (Multi-Channel Analysis of Surface Waves) is a geophysical method that uses surface waves to analyze conditions below the surface. This method calculate the value of the shear wave velocity to determine the soil structure and thickness. By knowing the soil condition of the research area, it is expected to determine the appropriate disaster mitigation scheme.

The microseismic method is a passive geophysical method that detects harmonic vibrations from the ground which occur continuously with a very small frequency range. This method can describe the level of vulnerability of the soil layer during shock events by its dominant frequency and amplification. With this information, one can determine the weak zone due to seismic events to detect potential area of earthquakes and landslides.

The gravity method is a passive geophysical method that measures variations in the earth’s gravitational field caused by differences in the density of rocks below the surface, which are known as gravitational field anomalies. This method can be used to identify the geological structure where the mineralization process occurs.

The magnetic method in geophysical studies is used to determine the magnetic field intensity variation. This method can be applied to investigate potential distribution of ore minerals by showing differences in magnetic values as anomalies at a location if there is a non-uniformity in the magnetic properties

The VLF (Very Low Frequency) method is an environmental friendly geophysical method that utilizes the electromagnetic field generated by a large-power radio transmitter operated with a frequency range of 15-30 kHz. The VLF method is commonly used for mineral exploration due to its ability to find high conductivity materials and can distinguish gold mineralization zones based on resistivity contrast with the surrounding rock.

The IP (Induced Polarization) method is an active geophysical method that utilizes the electrical properties and polarity of rocks, by injecting current into the earth. This method data is usually supported by resistivity method data which is measured at the same time. The physical properties measured are closely related to the physical properties of metallic minerals in the rock. So, this method is suitable for metal mineral exploration.

Theodosius Marwan Irnaka, S.Si., M.Sc & Afif Rakhman, S.Si., M.T.

Faculty Advisers Field Camp UGM 2022

Let us start with a well-known proverb: “Experience is the best teacher”.

This proverb resonates with the core aspects of the Geophysical Field Camp 2022 which will give the students a realistic experience as geophysicists before their graduation. We, as the advisors, are looking forward to supervising the Geophysical Field Camp 2022. This agenda will be held in Tirtomoyo sub-district, Wonogiri, Central Java. More than a hundred students of the Geophysics study program, Physics department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, in their third and fourth year will participate in this series of events. In this series of events, we aim to investigate three main objectives, namely investigating mineralization zones related to the existence of traditional mining, investigating geohazard potential in the form of landslides, and investigating the overall structure of the area. They will extensively apply their a priori knowledge to perform integrated geophysical methods and investigate the subsurface physical and geological model of the area. Many learning outcomes are expected from the student by organizing and carrying out Field Camp 2022. The students will learn how to prepare a good acquisition design based on the existing data and knowledge (previous geophysical survey and geological information). They will also learn how to prepare and operate several geophysical, positioning, and communication equipment while emphasizing safety, health, and the environment as their priority. Afterwards, the student will have to learn to manage, process and interpret the data that has been collected during the field campaign which yields an accurate, solid, comprehensive, and meaningful result of the subsurface structure model of the research area. Above all those, their knowledge and skill, attitudes, and teamwork will also be sharpened.

In short, Field Camp 2022 is experiential learning which places the students as the real geophysicist. Therefore, we encourage all of the participants, students, assistants, and facilitators to synergically contribute their best knowledge, skills, attitudes, and works to the success of this Geophysics Field Camp 2022.

Thank you very much.

Afif Rakhman & T. Marwan Irnaka

Dr.rer.nat. Nurul Hidayat Aprilita, M.Si.

Vice Dean for Academic and Student Affairs

As the dean of the Faculty of Mathematic and Natural Sciences Universitas Gadjah Mada, I’m pleased to welcome you to the Geophysics Field Camp 2022 organized by final year Geophysics  Students. The Geophysics Study Program is a part of Department of Physics, Faculty of Mathematics and Natural Sciences Universitas Gadjah Mada, Special Region of Yogyakarta.

The Faculty of Mathematics and Natural Sciences as a part of Universitas Gadjah Mada is the pioneer of the world class university that is superior and innovative, serving the nation’s interests and humanity imbued with national cultural values based on Pancasila. Based on the vision, The Faculty of Mathematics and Natural Sciences has a mission to carry out education, research, and community service as well as preservation of superior knowledge, and benefit the community. Field Camp 2022 is one  of  the  programs that is in line with the vision and mission that has been built. This program  provides  an  opportunity  to  develop  both academic and soft skills sets. Our institution encourages the students to be active, whether through scientific publications or  community  activities  that  are  very valuable to support the students’ career or academic path.

Saefull Alam Wisnutama

Project Manager of Field Camp UGM 2022

Geophysics Field Camp is one of the largest field work project organized by senior students of Geophysics Study Program Universitas Gadjah Mada. Geophysics field camp will be addressed as a professional geophysical project and carefully planned to benefit the community and stakeholders. Practical geophysical field experience is as important as the knowledge/understanding of the theory. As a geoscience student, we need to learn these necessary skills in a way that emphasizes our experience. Field Camp 2022 which themed “Geophysical Investigation to Uncover Mineral Prospect and HIRA (Hazard Identification and Risk Assesment) in Tirtomoyo District, Wonogiri” will provide an overview of a real geophysical field work to build the necessary skills to enhance geophysical knowledge and gain field experience.

We invite you to collaborate in an international field camp project to shape the skills of brightfutured geoscientist.

Best Regard,

Field Camp UGM 2022 Committee

Muhammad Naufal Syafiq A.

Vice Project Manager

Geophysics Field camp is an annual activity organized by SEG UGM-SC, Student Chapter of society of Exploration Geophysicist. This activity is organized by final year students and third year students of Geophysics study Program Gadjah Mada University. Geophysics Field camp are expected to have a positive impact on themselves and others.

               In this activity, we will establish ourselves as geophysicists with high integrity and skills. To establish ourselves as geophysicists, we will improve our capabilities in geophysics, both theory and practice in the field. We practice to acquire, process, and interpret the data, moreover, to conduct field work management. We also plan to organize social activities for the community that will be useful for daily life.

               With this event, we aim to develop young geoscientists to be professional geoscientists who are ready for their future careers. It is an extraordinary opportunity for us to be able to hold this event. Thanks a lot!

The geological survey is an activity aimed for the participants to learn more about the regional geology related to the research areas so that participants have a better understanding of the geological conditions of the study sites. The activity includes geological mapping to facilitate the determination of survey designs according to research targets. The activity will be held in December 2021.

Non-Seismic Field Work Study is a facility for 2022 Field Camp participants to improve their capabilities in data acquisition, data processing and geophysical data interpretation, also to learn about responsibility for themselves, groups, tools, and data obtained in the field and has sensitivity in understanding geophysical responses from the data obtained. The event was held on December 27, 2021.

This activity is an interactive discussion forum that presents professionals with experience in the field of geological disasters. So that participants are expected to be able to identify and have knowledge so that they can conduct quantitative studies of the potential for disasters in the research area. The seminar will be held on February 13, 2022.

The seminar will be discussing about basic knowledges and concepts of geophysical methods in conducting mineral exploration. Participants can discuss directly with speakers who are geophysicists in the field of mineral exploration. The activity was held on February 6, 2022.

The Geological Field Trip is an activity for 2022 Field Camp participants to go directly to the field before conducting a geophysical survey accompanied by a professional geologist. Through this field trip, participants are expected to have a better understanding of geomorphology, structure, and lithology in the field. The implementation of the activity is divided into 2 sessions, namely on January 18, 2021 and May 14, 2021.