obspy.core.event.origin.Arrival

class Arrival(force_resource_id=True, *args, **kwargs)[source]

Bases: obspy.core.event.base.__Arrival

Successful association of a pick with an origin qualifies this pick as an arrival. An arrival thus connects a pick with an origin and provides additional attributes that describe this relationship. Usually qualification of a pick as an arrival for a given origin is a hypothesis, which is based on assumptions about the type of arrival (phase) as well as observed and (on the basis of an earth model) computed arrival times, or the residual, respectively. Additional pick attributes like the horizontal slowness and backazimuth of the observed wave—especially if derived from array data—may further constrain the nature of the arrival.

Parameters
  • resource_id (ResourceIdentifier) – Resource identifier of Arrival.

  • force_resource_id (bool, optional) – If set to False, the automatic initialization of resource_id attribute in case it is not specified will be skipped.

  • pick_id (ResourceIdentifier) – Refers to the resource_id of a Pick.

  • phase (str) – Phase identification. For possible values, please refer to the description of the Phase object.

  • time_correction (float, optional) – Time correction value. Usually, a value characteristic for the station at which the pick was detected, sometimes also characteristic for the phase type or the slowness. Unit: s

  • azimuth (float, optional) – Azimuth of station as seen from the epicenter. Unit: deg

  • distance (float, optional) – Epicentral distance. Unit: deg

  • takeoff_angle (float, optional) – Angle of emerging ray at the source, measured against the downward normal direction. Unit: deg

  • takeoff_angle_errors (QuantityError) – AttribDict containing error quantities.

  • time_residual (float, optional) – Residual between observed and expected arrival time assuming proper phase identification and given the earth_model_ID of the Origin, taking into account the time_correction. Unit: s

  • horizontal_slowness_residual (float, optional) – Residual of horizontal slowness and the expected slowness given the current origin (refers to attribute horizontal_slowness of class Pick).

  • backazimuth_residual (float, optional) – Residual of backazimuth and the backazimuth computed for the current origin (refers to attribute backazimuth of class Pick).

  • time_weight (float, optional) – Weight of the arrival time for computation of the associated Origin. Note that the sum of all weights is not required to be unity.

  • horizontal_slowness_weight (float, optional) – Weight of the horizontal slowness for computation of the associated Origin. Note that the sum of all weights is not required to be unity.

  • backazimuth_weight (float, optional) – Weight of the backazimuth for computation of the associated Origin. Note that the sum of all weights is not required to be unity.

  • earth_model_id (ResourceIdentifier, optional) – Earth model which is used for the association of Arrival to Pick and computation of the residuals.

  • comments (list of Comment, optional) – Additional comments.

  • creation_info (CreationInfo, optional) – CreationInfo for the Arrival object.

Note

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

Attributes

__abstractmethods__

__dict__

__doc__

__hash__

__module__

__reversed__

__slots__

__weakref__

list of weak references to the object (if defined)

defaults

do_not_warn_on

item

key

readonly

warn_on_non_default_key

Public Methods

clear

copy

get

items

keys

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.

setdefault

update

If E present and has a .keys() method, does: for k in E: D[k] = E[k] If E present and lacks .keys() method, does: for (k, v) in E: D[k] = v In either case, this is followed by: for k, v in F.items(): D[k] = v

values

Private Methods

Warning

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.

_repr_pretty_

Special Methods

__bool__

__contains__

__deepcopy__

reset resource_id’s object_id after deep copy to allow the object specific behavior of get_referred_object

__delattr__

__delitem__

__dir__

Default dir() implementation.

__eq__

Two instances are considered equal if all attributes and all lists are identical.

__format__

Default object formatter.

__getattr__

Py3k hasattr() expects an AttributeError no KeyError to be raised if the attribute is not found.

__getitem__

__getstate__

__init__

__init_subclass__

This method is called when a class is subclassed.

__iter__

__len__

__ne__

__new__

Create and return a new object.

__nonzero__

__reduce__

Helper for pickle.

__reduce_ex__

Helper for pickle.

__repr__

__setattr__

Custom property implementation that works if the class is inheriting from AttribDict.

__setitem__

__setstate__

__sizeof__

Size of object in memory, in bytes.

__str__

Fairly extensive in an attempt to cover several use cases.

__subclasshook__

Abstract classes can override this to customize issubclass().