Which method of investigation allows geophysicists to best "visualize" or model a buried magma chamber beneath a caldera or crater formed on the earth's surface?

Seismic tomography

Explanation:

Seismic tomography is a technique for imaging the subsurface of the Earth with seismic waves produced by earthquakes or explosions. P-, S-, and surface waves can be used for tomographic models of different resolutions based on seismic wavelength, wave source distance, and the seismograph array coverage. The data collected can be represented in a 3D image for further investigation.