Earthquake with magnitude of Md 2.8 on date 20-09-1985 and time 22:42:24 (Italy) in region 6 km SE Cerreto di Spoleto (PG)

A magnitude Md 2.8 earthquake occured in region: 6 km SE Cerreto di Spoleto (PG), on

  • 20-09-1985 20:42:24 (UTC)
  • 20-09-1985 22:42:24 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.78, 12.96 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
Cerreto di Spoleto PG 6 1075 1075
Poggiodomo PG 7 117 1192
Cascia PG 8 3217 4409
Vallo di Nera PG 8 364 4773
Norcia PG 11 4957 9730
Sant'Anatolia di Narco PG 11 564 10294
Scheggino PG 13 461 10755
Sellano PG 13 1079 11834
Preci PG 13 724 12558
Monteleone di Spoleto PG 14 599 13157
Campello sul Clitunno PG 16 2442 15599
Spoleto PG 19 38218 53817

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SE of Foligno (57155 inhabitants)
35 Km NE of Terni (111501 inhabitants)
59 Km NW of L'Aquila (69753 inhabitants)
59 Km SE of Perugia (166134 inhabitants)
62 Km W of Teramo (54892 inhabitants)
81 Km NE of Viterbo (67173 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 2.8 1985-09-20
20:42:24
42.78 12.96 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 13509
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-09-20 20:42:24 ± 0.2
Latitude 42.78 ± 0.01
Longitude 12.96 ± 0.02
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 13509

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) 1908.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 113
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
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) 0.00324
Epicentral distance of station farthest from the epicenter (degree) 0.00923
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

Md:2.8

Field Value
Value 2.8
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 13509
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:16:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.RDP.Z. 1985-09-20T20:42:46.00 10.0 undecidable manual PN 189 0.0092 1.25 0.1
--.AM1.Z. 1985-09-20T20:42:42.90 10.0 undecidable manual PG 30 0.0081 0.51 0.7
--.ALP.Z. 1985-09-20T20:42:41.10 10.0 undecidable manual SG 88 0.004 0.4 0.7
--.MNS.Z. 1985-09-20T20:42:41.00 10.0 undecidable manual SG 207 0.004 0.38 0.5
--.CM2.Z. 1985-09-20T20:42:41.00 10.0 undecidable manual SG 17 0.0039 0.53 0.6
--.AS1.Z. 1985-09-20T20:42:38.00 10.0 undecidable manual SG 321 0.0032 -0.16 0.6
--.AQU.Z. 1985-09-20T20:42:35.00 10.0 undecidable manual PG 142 0.0048 -0.48 1
--.MNS.Z. 1985-09-20T20:42:33.00 10.0 undecidable manual PG 207 0.004 -0.82 0.5
--.CM2.Z. 1985-09-20T20:42:33.20 10.0 undecidable manual PG 17 0.0039 -0.52 2
--.ALP.Z. 1985-09-20T20:42:33.60 10.0 undecidable manual PG 88 0.004 -0.27 1.3
--.AS1.Z. 1985-09-20T20:42:32.50 10.0 positive manual PG 321 0.0032 0.1 2.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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