中研院地球科學研究所 - 地球動力學研究室
IES, Academia Sinica - Geodynamics Lab


Projects

Related projects are as follows

 Understanding the Life of the Tatun Volcanic Group: Integrated Analysis of Geophysical, Geochemical and Geodetic Observations

The Tatun Volcanic Group (TVG) in northern Taiwan, the only substantial land volcanic construct on the island, has been identified as a dormant active volcano. We propose to carry out comprehensive observations of various geophysical, geochemical, and geodetic types towards better understanding of the state and behavior of TVG. We intend to conduct a phase of 3 years; some of the observations are complementary and augment to those planned for TVG by other agencies in parallel, and some are new observational types. These include broad-band microseismic monitoring, traditional leveling transects, air-borne lidar surveys of bare-earth topography, continuous GPS station recording, tiltmeter monitoring, microseismicity monitoring, campaign-mode geophone array for dense monitoring of microseism, gravity campaign surveys of relative and absolute gravimetry, continuous superconducting gravimetry, magnetotelluric sounding of the crustal electric conductivity, soil gas sampling and chemistry, and geological sediment sampling and dating, in conjunction with other types of opportune observations of heat flow, hot spring sampling, temperature recording and groundwater level in wells, surface geomagnetic surveys, air-borne or space-borne interferometric synthetic aperture radar observations of regional topographic changes, and space-borne infrared remote sensing of regional surface temperature.

We anticipate to achieve the following for TVG:


The proposed project consists of 5 Sub-projects:


The end results can be expected to serve as scientific basis for policies on public security, health and safety, hazard prevention and mitigation, and possibly natural hazard warning system and practice. The scientific data will be provided freely in the public domain as soon as they are validated. To the extent of the success of the proposed work, the work can become a leading example of volcanic study that only a country that is fully committed to Earth monitoring and investigation, such as Taiwan, can afford to do and be capable of doing. The integrated project will strive to raise domestic attention of volcanoes by way of public outreach and education. In the long run, as we not only accumulate real observational data as time series but also build the capability in manpower of all aspects, we hope to be able to establish and build a heritage of knowledge in Taiwan about volcanoes, particularly those on our own land.

 Earth's Time-Variable Gravity : Data Analysis and Geophysical Significances Introduction

With the maturity of the space geodetic technique and the successful scientific developments and findings of the GRACE mission (launched in 2002), time-variable gravity (TVG) has become a new tool for remote sensing of the Earth's global changes, yielding important and unprecedented information about mass transport associated with many geophysical and climatic variations in the atmosphere-hydrosphere-cryosphere-solid Earth system. In this proposal we intend to investigate the following specific large-scale phenomena based on TVG observations and in conjunction with other independent data types, including satellite ocean altimetry, satellite laser ranging, as well as global circulation models (GCM) of atmosphere, ocean and hydrology:

  1. Earthquake effects on TVG: to study the kinematic and dynamic mechanisms by which earthquakes tend to make the Earth rounder and more compact, in particular the mechanism for decreasing J2
  2. Global hydrological water mass budget: combined usage of GRACE data and GCM outputs
  3. Ocean mixed layer depth (i.e. thermocline depth) variability: using historical and modern in situ data, and in conjunction with altimetry and GRACE to study the steric vs. mass-induced sea level change.

The proposed investigation is highly interdisciplinary in nature. The research is a continuation of an on-going 2-year investigation under NSC bearing the same title (currently 1.5 years into the work, the accomplishments are outlined in another section of this proposal.) In addition to the advancement of knowledge about the above specific areas, the proposal has the overall goal of establishing TVG research capability in Taiwan, in terms of understanding, modeling, and predicting the global/regional geophysical and climatic changes, which are of crucial importance to the human livelihood and sustainability. On account of the degree of elaboration of these studies and the fact that they require considerable training of investigators and development of computing methodologies, we propose a time period of 2 years, aiming to be able to continue the studies beyond the 2 years with enlarged and refined scope and more advanced data.