class Axis(*args, **kwargs)[source]

Bases: obspy.core.event.base.__Axis

This class describes an eigenvector of a moment tensor expressed in its principal-axes system. It uses the angles azimuth, plunge, and the eigenvalue length.

  • azimuth (float) Azimuth of eigenvector of moment tensor expressed in principal-axes system. Measured clockwise from South-North direction at epicenter. Unit: deg
  • azimuth_errors (QuantityError) AttribDict containing error quantities.
  • plunge (float) Plunge of eigenvector of moment tensor expressed in principal-axes system. Measured against downward vertical direction at epicenter. Unit: deg
  • plunge_errors (QuantityError) AttribDict containing error quantities.
  • length (float) Eigenvalue of moment tensor expressed in principal-axes system. Unit: Nm
  • length_errors (QuantityError) AttribDict containing error quantities.


For handling additional information not covered by the QuakeML standard and how to output it to QuakeML see the ObsPy Tutorial.


__abstractmethods__ frozenset() -> empty frozenset object
__doc__ str(object=’‘) -> str
__module__ str(object=’‘) -> str
__slots__ tuple() -> empty tuple
__weakref__ list of weak references to the object (if defined)
defaults dict() -> new empty dictionary
do_not_warn_on list() -> new empty list
item tuple() -> empty tuple
key str(object=’‘) -> str
readonly list() -> new empty list
warn_on_non_default_key bool(x) -> bool

Public Methods

pop If key is not found, d is returned if given, otherwise KeyError is raised.
popitem as a 2-tuple; but raise KeyError if D is empty.

Private Methods


Private methods are mainly for internal/developer use and their API might change without notice.

_pretty_str Return better readable string representation of AttribDict object.

Special Methods

__dir__ default dir() implementation
__eq__ Two instances are considered equal if all attributes and all lists
__format__ default object formatter
__getattr__ Py3k hasattr() expects an AttributeError no KeyError to be
__new__ Create and return a new object.
__reduce__ helper for pickle
__reduce_ex__ helper for pickle
__setattr__ Custom property implementation that works if the class is
__sizeof__ size of object in memory, in bytes
__str__ Fairly extensive in an attempt to cover several use cases.