Earthquake with magnitude of Md 2.0 on date 23-12-1985 and time 21:06:33 (Italy) in region 2 km E Bastia Umbra (PG)

A magnitude Md 2.0 earthquake occured in region: 2 km E Bastia Umbra (PG), on

  • 23-12-1985 20:06:33 (UTC)
  • 23-12-1985 21:06:33 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.06, 12.57 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Bastia Umbra PG 2 21874 21874
Assisi PG 4 28299 50173
Cannara PG 7 4305 54478
Bettona PG 9 4367 58845
Spello PG 11 8645 67490
Valfabbrica PG 12 3389 70879
Torgiano PG 12 6725 77604
Bevagna PG 14 5081 82685
Valtopina PG 15 1398 84083
Deruta PG 15 9669 93752
Foligno PG 16 57155 150907
Perugia PG 16 166134 317041
Gualdo Cattaneo PG 17 6155 323196
Nocera Umbra PG 19 5839 329035
Montefalco PG 19 5679 334714

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km NW of Foligno (57155 inhabitants)
16 Km E of Perugia (166134 inhabitants)
56 Km N of Terni (111501 inhabitants)
72 Km SE of Arezzo (99543 inhabitants)
81 Km NE of Viterbo (67173 inhabitants)
95 Km SW of Fano (60888 inhabitants)
99 Km SW of Ancona (100861 inhabitants)
99 Km S of Pesaro (94582 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 Md 2.0 1985-12-23
20:06:33
43.06 12.57 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 18729
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-12-23 20:06:33 ± 0.257
Latitude 43.06 ± 0.05
Longitude 12.57 ± 0.01
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 18729

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 5210
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 202
Number of associated phases, regardless of their use for origin computation 5
Number of defining phases 5
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00049
Epicentral distance of station farthest from the epicenter (degree) 0.00389
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2

Field Value
Value 2
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 18729
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:21:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CM2.Z. 1985-12-23T20:06:49.14 10.0 undecidable manual SG 71 0.0039 -0.21 0.6
--.CM2.Z. 1985-12-23T20:06:42.93 10.0 undecidable manual PG 71 0.0039 0.29 0.7
--.PRG.Z. 1985-12-23T20:06:37.00 10.0 undecidable manual PG 288 0.0012 -0.09 1.9
--.ASS.Z. 1985-12-23T20:06:37.00 10.0 undecidable manual SG 86 0.0005 -0.57 0.1
--.ASS.Z. 1985-12-23T20:06:36.00 10.0 undecidable manual PG 86 0.0005 0.16 1.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download