Earthquake with magnitude of Md 2.6 on date 19-08-1985 and time 20:14:28 (Italy) in region 4 km NE Norcia (PG)

A magnitude Md 2.6 earthquake occured in region: 4 km NE Norcia (PG), on

  • 19-08-1985 18:14:28 (UTC)
  • 19-08-1985 20:14:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.82, 13.13 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
Norcia PG 4 4957 4957
Castelsantangelo sul Nera MC 9 281 5238
Preci PG 11 724 5962
Visso MC 14 1107 7069
Arquata del Tronto AP 14 1178 8247
Ussita MC 15 444 8691
Cascia PG 15 3217 11908
Accumoli RI 16 667 12575
Montegallo AP 17 523 13098
Cerreto di Spoleto PG 18 1075 14173
Montemonaco AP 18 604 14777
Sellano PG 19 1079 15856
Poggiodomo PG 20 117 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
50 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
69 Km E of Perugia (166134 inhabitants)
90 Km W of Montesilvano (53738 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
95 Km E of Viterbo (67173 inhabitants)
97 Km W of Pescara (121014 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
99 Km N of Tivoli (56533 inhabitants)
99 Km NW of Chieti (51815 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 2.6 1985-08-19
18:14:28
42.82 13.13 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 12089
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-08-19 18:14:28 ± 0.1
Latitude 42.82 ± 0.01
Longitude 13.13 ± 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 12089

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) 921.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 114
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00251
Epicentral distance of station farthest from the epicenter (degree) 0.00623
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 12089
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:15:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AR1.Z. 1985-08-19T18:14:53.00 10.0 undecidable manual SG 348 0.0062 0.46 0.2
--.MNS.Z. 1985-08-19T18:14:47.50 10.0 undecidable manual SG 217 0.0049 -0.15 0.6
--.AS1.Z. 1985-08-19T18:14:43.80 10.0 undecidable manual SG 305 0.0038 -0.18 0.6
--.AR1.Z. 1985-08-19T18:14:42.00 10.0 undecidable manual PG 348 0.0062 -0.27 0.9
--.CM2.Z. 1985-08-19T18:14:42.20 10.0 undecidable manual SG 0 0.0033 -0.07 1.1
--.ALP.Z. 1985-08-19T18:14:40.70 10.0 undecidable manual SG 96 0.0028 0.27 0.7
--.MNS.Z. 1985-08-19T18:14:39.00 10.0 undecidable manual PG 217 0.0049 -0.45 0.5
--.AS1.Z. 1985-08-19T18:14:37.70 10.0 undecidable manual PG 305 0.0038 0.37 0.8
--.CM2.Z. 1985-08-19T18:14:36.20 10.0 undecidable manual PG 0 0.0033 -0.15 1.6
--.PO9.Z. 1985-08-19T18:14:35.00 10.0 undecidable manual PG 210 0.0025 0.46 0.5
--.ALP.Z. 1985-08-19T18:14:35.20 10.0 negative manual PG 96 0.0028 -0.09 3.5
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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