Earthquake with magnitude of Md 2.7 on date 28-07-1986 and time 11:52:42 (Italy) in region 5 km W Vallo di Nera (PG)

A magnitude Md 2.7 earthquake occured in region: 5 km W Vallo di Nera (PG), on

  • 28-07-1986 09:52:42 (UTC)
  • 28-07-1986 11:52:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.79, 12.81 at 6 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
Vallo di Nera PG 5 364 364
Campello sul Clitunno PG 5 2442 2806
Sant'Anatolia di Narco PG 6 564 3370
Spoleto PG 8 38218 41588
Scheggino PG 8 461 42049
Cerreto di Spoleto PG 9 1075 43124
Trevi PG 12 8469 51593
Castel Ritaldi PG 12 3278 54871
Poggiodomo PG 13 117 54988
Sellano PG 15 1079 56067
Montefalco PG 18 5679 61746
Cascia PG 18 3217 64963
Ferentillo TR 18 1913 66876
Monteleone di Spoleto PG 19 599 67475
Giano dell'Umbria PG 20 3846 71321

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km SE of Foligno (57155 inhabitants)
28 Km NE of Terni (111501 inhabitants)
50 Km SE of Perugia (166134 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
71 Km NE of Viterbo (67173 inhabitants)
74 Km W of Teramo (54892 inhabitants)
88 Km N of Guidonia Montecelio (88673 inhabitants)
91 Km N of Tivoli (56533 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 2.7 1986-07-28
09:52:42
42.79 12.81 6 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 31719
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-07-28 09:52:42 ± 0.36
Latitude 42.79 ± 0.01
Longitude 12.81 ± 0.04
Depth (km) 6 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 31719

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) 3408.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 185
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) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00267
Epicentral distance of station farthest from the epicenter (degree) 0.00931
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:2.7

Field Value
Value 2.7
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 31719
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:32:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CRE.Z. 1986-07-28T09:53:18.50 10.0 undecidable manual SG 323 0.0093 -0.49 0.5
--.ARV.Z. 1986-07-28T09:53:09.00 10.0 undecidable manual SG 7 0.0064 0.41 0.5
--.CRE.Z. 1986-07-28T09:53:04.50 10.0 undecidable manual PG 323 0.0093 0.82 0.4
--.ARV.Z. 1986-07-28T09:52:57.30 10.0 undecidable manual PG 7 0.0064 -0.38 1.4
--.ASS.Z. 1986-07-28T09:52:54.00 10.0 undecidable manual SG 337 0.0027 -0.48 0.7
--.MNS.Z. 1986-07-28T09:52:51.80 10.0 undecidable manual PG 193 0.0036 -0.19 1.8
--.ASS.Z. 1986-07-28T09:52:49.80 10.0 undecidable manual PG 337 0.0027 0.27 1.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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