  Electron spin qubits are a promising platform for quantum computation.
Environmental noise impedes coherent operations by limiting the qubit
relaxation ($T_1$) and dephasing ($T_{\phi}$) times. There are multiple sources
of such noise, which makes it important to devise experimental techniques that
can detect the spatial locations of these sources and determine which is the
most important. In this paper, we propose that anisotropy in $T_1$ and
$T_{\phi}$ with respect to the direction of the applied magnetic field can
reveal much about these aspects of the noises. We investigate the anisotropy
patterns of charge noise, evanescent-wave Johnson noise, and hyperfine noise.
It is necessary to have a rather well-characterized sample to get the maximum
benefit from this technique. The general anisotropy patterns are elucidated and
then we calculate the expected anisotropy in a particular Si/SiGe quantum dot
device.
