Source code for pyrocko.client.usgs

# http://pyrocko.org - GPLv3
#
# The Pyrocko Developers, 21st Century
# ---|P------/S----------~Lg----------
from __future__ import absolute_import, division

import time
import logging

from pyrocko import util, model
from pyrocko.util import urlopen_ssl_check
from .base_catalog import EarthquakeCatalog

logger = logging.getLogger('pyrocko.client.usgs')

km = 1000.


[docs]class USGS(EarthquakeCatalog): def __init__(self, catalog=None): self.catalog = catalog self.events = {} def flush(self): self.events = {} def iter_event_names( self, time_range=None, magmin=0., magmax=10., latmin=-90., latmax=90., lonmin=-180., lonmax=180.): yearbeg, monbeg, daybeg = time.gmtime(time_range[0])[:3] yearend, monend, dayend = time.gmtime(time_range[1])[:3] p = [] a = p.append a('format=geojson') if self.catalog is not None: a('catalog=%s' % self.catalog.lower()) a('starttime=%s' % util.time_to_str( time_range[0], format='%Y-%m-%dT%H:%M:%S')) a('endtime=%s' % util.time_to_str( time_range[1], format='%Y-%m-%dT%H:%M:%S')) if latmin != -90.: a('minlatitude=%g' % latmin) if latmax != 90.: a('maxlatitude=%g' % latmax) if lonmin != -180.: a('minlongitude=%g' % lonmin) if lonmax != 180.: a('maxlongitude=%g' % lonmax) if magmin != 0.: a('minmagnitude=%g' % magmin) if magmax != 10.: a('maxmagnitude=%g' % magmax) url = 'https://earthquake.usgs.gov/fdsnws/event/1/query?' + '&'.join(p) logger.debug('Opening URL: %s' % url) page = urlopen_ssl_check(url).read() logger.debug('Received page (%i bytes)' % len(page)) events = self._parse_events_page(page) for ev in events: self.events[ev.name] = ev for ev in events: if time_range[0] <= ev.time and ev.time <= time_range[1]: yield ev.name def _parse_events_page(self, page): import json doc = json.loads(page.decode('utf-8')) events = [] for feat in doc['features']: props = feat['properties'] geo = feat['geometry'] lon, lat, depth = [float(x) for x in geo['coordinates']] t = util.str_to_time('1970-01-01 00:00:00') + \ props['time'] * 0.001 if props['mag'] is not None: mag = float(props['mag']) else: mag = None if props['place'] is not None: region = props['place'].encode('ascii', 'replace').decode() else: region = None catalog = str(props['net'].upper()) name = 'USGS-%s-' % catalog + util.time_to_str( t, format='%Y-%m-%d_%H-%M-%S.3FRAC') ev = model.Event( lat=lat, lon=lon, time=t, name=name, depth=depth*1000., magnitude=mag, region=region, catalog=catalog) events.append(ev) return events def get_event(self, name): if name not in self.events: t = self._name_to_date(name) for name2 in self.iter_event_names( time_range=(t-24*60*60, t+24*60*60)): if name2 == name: break return self.events[name] def _name_to_date(self, name): ds = name[-23:] t = util.str_to_time(ds, format='%Y-%m-%d_%H-%M-%S.3FRAC') return t