Earthquake with magnitude of Md 2.0 on date 21-05-1987 and time 12:08:00 (Italy) in region 7 km NW Valfabbrica (PG)

A magnitude Md 2.0 earthquake occured in region: 7 km NW Valfabbrica (PG), on

  • 21-05-1987 10:08:00 (UTC)
  • 21-05-1987 12:08:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.2220, 12.5700 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
Valfabbrica PG 7 3389 3389
Gubbio PG 15 32216 35605
Assisi PG 17 28299 63904
Bastia Umbra PG 17 21874 85778
Gualdo Tadino PG 18 15208 100986
Fossato di Vico PG 18 2840 103826
Sigillo PG 19 2404 106230
Costacciaro PG 19 1216 107446
Perugia PG 19 166134 273580

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km NE of Perugia (166134 inhabitants)
32 Km NW of Foligno (57155 inhabitants)
62 Km E of Arezzo (99543 inhabitants)
74 Km N of Terni (111501 inhabitants)
78 Km SW of Fano (60888 inhabitants)
82 Km SW of Pesaro (94582 inhabitants)
88 Km SW of Ancona (100861 inhabitants)
93 Km S of Rimini (147750 inhabitants)
97 Km NE of Viterbo (67173 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
Bulletin
Rev1000
Md 2.0 1987-05-21
10:08:00
43.222 12.57 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 47479
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-05-21 10:08:00 ± 0.035
Latitude 43.2220 ± 0.0022
Longitude 12.5700 ± 0.0017
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 47479

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) 277.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 227
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
Epicentral distance of station closest to the epicenter (degree) 0.00146
Epicentral distance of station farthest from the epicenter (degree) 0.00372
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:2.0

Field Value
Value 2.0
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 47479
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:46:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.CM8.Z. 1987-05-21T10:08:16.20 10.0 undecidable manual SG 93 0.4107 -0.02 0.7
--.CM8.Z. 1987-05-21T10:08:09.54 10.0 undecidable manual PG 93 0.4107 0 1.2
--.ASS.Z. 1987-05-21T10:08:08.00 10.0 undecidable manual SG 159 0.1665 -0.06 0.5
--.PRG.Z. 1987-05-21T10:08:05.00 10.0 undecidable manual PG 226 0.1665 -0.02 1.4
--.ASS.Z. 1987-05-21T10:08:05.00 10.0 undecidable manual PG 159 0.1665 0.06 1.2
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download