Earthquake with magnitude of Md 2.1 on date 04-05-1987 and time 18:18:40 (Italy) in region 7 km E Pietralunga (PG)

A magnitude Md 2.1 earthquake occured in region: 7 km E Pietralunga (PG), on

  • 04-05-1987 16:18:40 (UTC)
  • 04-05-1987 18:18:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4480, 12.5200 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
Pietralunga PG 7 2111 2111
Cantiano PU 9 2245 4356
Gubbio PG 12 32216 36572
Scheggia e Pascelupo PG 13 1393 37965
Apecchio PU 15 1882 39847
Cagli PU 15 8731 48578
Piobbico PU 16 2029 50607
Montone PG 18 1680 52287
Costacciaro PG 18 1216 53503
Frontone PU 19 1300 54803

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km N of Perugia (166134 inhabitants)
51 Km E of Arezzo (99543 inhabitants)
57 Km N of Foligno (57155 inhabitants)
60 Km SW of Fano (60888 inhabitants)
61 Km SW of Pesaro (94582 inhabitants)
68 Km S of Rimini (147750 inhabitants)
80 Km S of Cesena (96758 inhabitants)
83 Km W of Ancona (100861 inhabitants)
94 Km SE of Forlì (117913 inhabitants)
97 Km E of Siena (53903 inhabitants)
99 Km N of Terni (111501 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 2.1 1987-05-04
16:18:40
43.448 12.52 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 46329
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-05-04 16:18:40 ± 0.928
Latitude 43.4480 ± 0.0390
Longitude 12.5200 ± 0.0589
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 46329

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) 6436.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 245
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00275
Epicentral distance of station farthest from the epicenter (degree) 0.00461
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 46329
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:45:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.CM8.Z. 1987-05-04T16:19:00.24 10.0 undecidable manual SG 119 0.5106 1.31 0.2
--.ASS.Z. 1987-05-04T16:18:54.50 10.0 undecidable manual SG 166 0.3996 -0.5 0.5
--.ARV.Z. 1987-05-04T16:18:52.00 10.0 undecidable manual SG 80 0.3108 -0.26 0.6
--.CM8.Z. 1987-05-04T16:18:50.63 10.0 negative manual PG 119 0.5106 -0.44 2.5
--.PRG.Z. 1987-05-04T16:18:49.00 10.0 undecidable manual PG 194 0.3552 0.93 0.7
--.ASS.Z. 1987-05-04T16:18:48.00 10.0 undecidable manual PG 166 0.3996 -0.8 0.9
--.ARV.Z. 1987-05-04T16:18:47.50 10.0 undecidable manual PG 80 0.3108 0.28 1.6
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