# http://pyrocko.org - GPLv3
#
# The Pyrocko Developers, 21st Century
# ---|P------/S----------~Lg----------
from __future__ import absolute_import, division
import time
import calendar
import re
import logging
from pyrocko import model, util
from pyrocko.moment_tensor import MomentTensor
from pyrocko.util import Request, urlopen
from .base_catalog import EarthquakeCatalog
import numpy as num
logger = logging.getLogger('pyrocko.client.globalcmt')
km = 1000.
class Anon(object):
pass
[docs]class GlobalCMT(EarthquakeCatalog):
def __init__(self):
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.,
depthmin=0.,
depthmax=1000*km):
yearbeg, monbeg, daybeg = time.gmtime(time_range[0])[:3]
yearend, monend, dayend = time.gmtime(time_range[1])[:3]
url = 'http://www.globalcmt.org/cgi-bin/globalcmt-cgi-bin/CMT5/form?' \
+ '&'.join([
'itype=ymd',
'yr=%i' % yearbeg, 'mo=%i' % monbeg, 'day=%i' % daybeg,
'otype=ymd',
'oyr=%i' % yearend, 'omo=%i' % monend, 'oday=%i' % dayend,
'jyr=1976', 'jday=1', 'ojyr=1976', 'ojday=1', 'nday=1',
'lmw=%g' % magmin, 'umw=%g' % magmax,
'lms=0', 'ums=10',
'lmb=0', 'umb=10',
'llat=%g' % latmin, 'ulat=%g' % latmax,
'llon=%g' % lonmin, 'ulon=%g' % lonmax,
'lhd=%g' % (depthmin/km), 'uhd=%g' % (depthmax/km),
'lts=-9999', 'uts=9999',
'lpe1=0', 'upe1=90',
'lpe2=0', 'upe2=90',
'list=5'])
while True:
logger.debug('Opening URL: %s' % url)
req = Request(url)
page = urlopen(req).read()
logger.debug('Received page (%i bytes)' % len(page))
events, more = 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
if more:
url = more.decode('ascii')
else:
break
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+2*24*60*60)):
if name2 == name:
break
return self.events[name]
def _parse_events_page(self, page):
lines = page.splitlines()
state = 0
events = []
def complete(data):
try:
t = util.to_time_float(
calendar.timegm((
data.year, data.month, data.day,
data.hour, data.minute, data.seconds)))
m = num.array(
[data.mrr, data.mrt, data.mrp,
data.mrt, data.mtt, data.mtp,
data.mrp, data.mtp, data.mpp],
dtype=float).reshape(3, 3)
m *= 10.0**(data.exponent-7)
mt = MomentTensor(m_up_south_east=m)
ev = model.Event(
lat=data.lat,
lon=data.lon,
time=t,
name=data.eventname,
depth=data.depth_km*1000.,
magnitude=float(mt.moment_magnitude()),
duration=data.half_duration * 2.,
region=data.region.rstrip(),
catalog=data.catalog)
ev.moment_tensor = mt
events.append(ev)
except AttributeError:
pass
catalog = 'gCMT'
data = None
more = None
for line in lines:
if state == 0:
m = re.search(br'<a href="([^"]+)">More solutions', line)
if m:
more = m.group(1)
m = re.search(br'From Quick CMT catalog', line)
if m:
catalog = 'gCMT-Q'
m = re.search(br'Event name:\s+(\S+)', line)
if m:
if data:
complete(data)
data = Anon()
data.eventname = str(m.group(1).decode('ascii'))
data.catalog = catalog
if data:
m = re.search(br'Region name:\s+([^<]+)', line)
if m:
data.region = str(m.group(1).decode('ascii'))
m = re.search(
br'Date \(y/m/d\): (\d\d\d\d)/(\d+)/(\d+)', line)
if m:
data.year, data.month, data.day = (
int(m.group(1)), int(m.group(2)), int(m.group(3)))
m = re.search(br'Timing and location information', line)
if m:
state = 1
if state == 1:
toks = line.split()
if toks and toks[0] == b'CMT':
data.hour, data.minute = [int(x) for x in toks[1:3]]
data.seconds, data.lat, data.lon, data.depth_km = [
float(x) for x in toks[3:]]
m = re.search(br'Assumed half duration:\s+(\S+)', line)
if m:
data.half_duration = float(m.group(1))
m = re.search(br'Mechanism information', line)
if m:
state = 2
if state == 2:
m = re.search(br'Exponent for moment tensor:\s+(\d+)', line)
if m:
data.exponent = int(m.group(1))
toks = line.split()
if toks and toks[0] == b'CMT':
data.mrr, data.mtt, data.mpp, \
data.mrt, data.mrp, data.mtp = [
float(x) for x in toks[1:]]
m = re.search(br'^Eigenvector:', line)
if m:
state = 0
if data is not None:
complete(data)
return events, more
def _name_to_date(self, name):
if len(name) == 7:
y, m, d = time.strptime(name[:6], '%m%d%y')[:3]
if y > 2005:
y -= 100
else:
y, m, d = time.strptime(name[:8], '%Y%m%d')[:3]
t = util.to_time_float(
calendar.timegm((y, m, d, 0, 0, 0)))
return t
