Earthquake with magnitude of Md 2.9 on date 17-09-1985 and time 19:12:23 (Italy) in region 5 km SE Norcia (PG)

A magnitude Md 2.9 earthquake occured in region: 5 km SE Norcia (PG), on

  • 17-09-1985 17:12:23 (UTC)
  • 17-09-1985 19:12:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.77, 13.15 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 5 4957 4957
Accumoli RI 12 667 5624
Arquata del Tronto AP 12 1178 6802
Cascia PG 12 3217 10019
Castelsantangelo sul Nera MC 14 281 10300
Preci PG 15 724 11024
Cittareale RI 17 482 11506
Montegallo AP 17 523 12029
Poggiodomo PG 19 117 12146
Visso MC 19 1107 13253
Amatrice RI 19 2657 15910
Ussita MC 20 444 16354
Cerreto di Spoleto PG 20 1075 17429

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km SE of Foligno (57155 inhabitants)
47 Km W of Teramo (54892 inhabitants)
47 Km E of Terni (111501 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
73 Km SE of Perugia (166134 inhabitants)
87 Km W of Montesilvano (53738 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
93 Km W of Pescara (121014 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
94 Km NE of Tivoli (56533 inhabitants)
95 Km W of Chieti (51815 inhabitants)
99 Km SW of Ancona (100861 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 2.9 1985-09-17
17:12:23
42.77 13.15 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 13319
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-09-17 17:12:23 ± 0.358
Latitude 42.77 ± 0.02
Longitude 13.15 ± 0.04
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 13319

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) 3854
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 86
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.9
Epicentral distance of station closest to the epicenter (degree) 0.00275
Epicentral distance of station farthest from the epicenter (degree) 0.01044
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

Md:2.9

Field Value
Value 2.9
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 13319
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:16:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SD1.Z. 1985-09-17T17:13:04.00 10.0 undecidable manual SN 155 0.0104 2.61 0
--.RDP.Z. 1985-09-17T17:13:01.00 10.0 undecidable manual SN 198 0.0095 2.14 0.1
--.AM1.Z. 1985-09-17T17:12:54.10 10.0 undecidable manual SG 22 0.0076 1.8 0.3
--.SD1.Z. 1985-09-17T17:12:46.00 10.0 undecidable manual PN 155 0.0104 0.76 1
--.RDP.Z. 1985-09-17T17:12:45.50 10.0 undecidable manual PN 198 0.0095 1.73 0.5
--.MNS.Z. 1985-09-17T17:12:41.00 10.0 undecidable manual SG 222 0.0046 -0.67 0.6
--.AQU.Z. 1985-09-17T17:12:41.00 10.0 undecidable manual SG 156 0.004 1.33 0.4
--.AS1.Z. 1985-09-17T17:12:40.80 10.0 undecidable manual SG 309 0.0042 0.7 0.6
--.AM1.Z. 1985-09-17T17:12:39.20 10.0 undecidable manual PG 22 0.0076 -0.79 2.5
--.CM2.Z. 1985-09-17T17:12:39.60 10.0 undecidable manual SG 359 0.0038 0.93 0.8
--.ALP.Z. 1985-09-17T17:12:33.50 10.0 undecidable manual SG 88 0.0028 -1.41 0.5
--.MNS.Z. 1985-09-17T17:12:32.50 10.0 positive manual PG 222 0.0046 -1.35 1.9
--.AS1.Z. 1985-09-17T17:12:32.80 10.0 undecidable manual PG 309 0.0042 -0.14 1.8
--.AQU.Z. 1985-09-17T17:12:31.50 10.0 undecidable manual PG 156 0.004 -1.2 1.1
--.CM2.Z. 1985-09-17T17:12:31.90 10.0 undecidable manual PG 359 0.0038 -0.22 3.5
--.ALP.Z. 1985-09-17T17:12:28.50 10.0 undecidable manual PG? 88 0.0028 -1.45 0.3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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