ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Md 1.9 on date 10-08-1985 and time 15:48:17 (Italy) in region 6 km NE Norcia (PG)

A magnitude Md 1.9 earthquake occured in region: 6 km NE Norcia (PG), on

  • 10-08-1985 13:48:17 (UTC)
  • 10-08-1985 15:48:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.84, 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 6 4957 4957
Castelsantangelo sul Nera MC 7 281 5238
Preci PG 10 724 5962
Visso MC 12 1107 7069
Ussita MC 12 444 7513
Arquata del Tronto AP 14 1178 8691
Montegallo AP 15 523 9214
Montemonaco AP 16 604 9818
Cascia PG 17 3217 13035
Accumoli RI 18 667 13702
Cerreto di Spoleto PG 19 1075 14777
Sellano PG 19 1079 15856
Bolognola MC 19 142 15998
Montefortino FM 20 1178 17176

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km E of Foligno (57155 inhabitants)
50 Km W of Teramo (54892 inhabitants)
51 Km NE of Terni (111501 inhabitants)
58 Km NW of L'Aquila (69753 inhabitants)
69 Km E of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
92 Km SW of Ancona (100861 inhabitants)
97 Km W of Pescara (121014 inhabitants)
97 Km E of Viterbo (67173 inhabitants)
99 Km NE of Guidonia Montecelio (88673 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
Rev 1000 Md 1.9 1985-08-10
13:48:17
42.84 13.15 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 11449
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-08-10 13:48:17 ± 0.206
Latitude 42.84 ± 0.01
Longitude 13.15 ± 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 11449

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) 2093.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 149
Number of associated phases, regardless of their use for origin computation 5
Number of defining phases 5
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00267
Epicentral distance of station farthest from the epicenter (degree) 0.00316
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:1.9

Field Value
Value 1.9
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 11449
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:14:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CM2.Z. 1985-08-10T13:48:31.50 10.0 undecidable manual SG 359 0.0032 0.48 0.3
--.ALP.Z. 1985-08-10T13:48:30.20 10.0 undecidable manual SG 100 0.0028 0.59 0.2
--.CM2.Z. 1985-08-10T13:48:25.00 10.0 undecidable manual PG 359 0.0032 -0.37 0.8
--.ALP.Z. 1985-08-10T13:48:24.30 10.0 negative manual PG 100 0.0028 -0.25 2.3
--.PO9.Z. 1985-08-10T13:48:24.50 10.0 undecidable manual PG 210 0.0027 0.16 1.3
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