ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Md 2.2 on date 11-08-1985 and time 05:09:35 (Italy) in region 2 km NW Norcia (PG)

A magnitude Md 2.2 earthquake occured in region: 2 km NW Norcia (PG), on

  • 11-08-1985 03:09:35 (UTC)
  • 11-08-1985 05:09:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.81, 13.07 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 3 4957 4957
Preci PG 8 724 5681
Cascia PG 11 3217 8898
Castelsantangelo sul Nera MC 12 281 9179
Cerreto di Spoleto PG 13 1075 10254
Visso MC 14 1107 11361
Sellano PG 15 1079 12440
Poggiodomo PG 15 117 12557
Ussita MC 16 444 13001
Vallo di Nera PG 18 364 13365
Arquata del Tronto AP 19 1178 14543
Accumoli RI 19 667 15210
Monteleone di Spoleto PG 20 599 15809

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
54 Km W of Teramo (54892 inhabitants)
57 Km NW of L'Aquila (69753 inhabitants)
65 Km SE of Perugia (166134 inhabitants)
90 Km E of Viterbo (67173 inhabitants)
94 Km W of Montesilvano (53738 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km N of Tivoli (56533 inhabitants)
97 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 2.2 1985-08-11
03:09:35
42.81 13.07 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 11499
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-08-11 03:09:35 ± 0.247
Latitude 42.81 ± 0.01
Longitude 13.07 ± 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 11499

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) 2473.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 107
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) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00227
Epicentral distance of station farthest from the epicenter (degree) 0.01101
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:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 11499
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:14:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.RDP.Z. 1985-08-11T03:10:12.50 10.0 undecidable manual SN 194 0.0097 0.79 0.3
--.SD1.Z. 1985-08-11T03:09:59.50 10.0 undecidable manual PN 153 0.011 1.09 0.5
--.RDP.Z. 1985-08-11T03:09:57.50 10.0 undecidable manual PN? 194 0.0097 1.09 0.2
--.CM2.Z. 1985-08-11T03:09:51.40 10.0 undecidable manual SG 7 0.0035 1.52 0.2
--.AS1.Z. 1985-08-11T03:09:50.50 10.0 undecidable manual SG 309 0.0036 0.29 0.7
--.ALP.Z. 1985-08-11T03:09:49.10 10.0 undecidable manual SG 94 0.0032 -0.04 0.8
--.PO9.Z. 1985-08-11T03:09:45.50 10.0 undecidable manual SG 202 0.0023 -0.02 0.8
--.AS1.Z. 1985-08-11T03:09:43.50 10.0 undecidable manual PG 309 0.0036 -0.5 1.6
--.CM2.Z. 1985-08-11T03:09:43.40 10.0 undecidable manual PG 7 0.0035 -0.41 3.5
--.ALP.Z. 1985-08-11T03:09:42.60 10.0 undecidable manual PG 94 0.0032 -0.79 1.2
--.PO9.Z. 1985-08-11T03:09:40.50 10.0 undecidable manual PG 202 0.0023 -0.79 1.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download