Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.3 on date 01-03-1991 and time 09:22:40 (UTC) in region 5 km S Cagnano Amiterno (AQ)

A magnitude Md 2.3 earthquake occured in region: 5 km S Cagnano Amiterno (AQ), on

  • 01-03-1991 09:22:40 (UTC)
  • 01-03-1991 10:22:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.4150, 13.2230 at 5 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Cagnano Amiterno AQ 5 1369 1369
Scoppito AQ 6 3727 5096
Barete AQ 6 737 5833
Pizzoli AQ 7 4326 10159
Antrodoco RI 12 2588 12747
Montereale AQ 12 2581 15328
Borbona RI 13 617 15945
Capitignano AQ 14 665 16610
Borgo Velino RI 14 972 17582
Micigliano RI 14 127 17709
Tornimparte AQ 15 3187 20896
Castel Sant'Angelo RI 16 1308 22204
Posta RI 16 694 22898
L'Aquila AQ 16 69753 92651
Lucoli AQ 17 1011 93662
Petrella Salto RI 18 1197 94859
Fiamignano RI 18 1413 96272

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km W of L'Aquila (69753 inhabitants)
48 Km SW of Teramo (54892 inhabitants)
50 Km E of Terni (111501 inhabitants)
61 Km NE of Tivoli (56533 inhabitants)
62 Km NE of Guidonia Montecelio (88673 inhabitants)
74 Km SE of Foligno (57155 inhabitants)
77 Km W of Montesilvano (53738 inhabitants)
78 Km W of Chieti (51815 inhabitants)
82 Km W of Pescara (121014 inhabitants)
84 Km NE of Roma (2864731 inhabitants)
89 Km NE of Velletri (53303 inhabitants)
92 Km E of Viterbo (67173 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 2.3
M 2.5 		1991-03-01
09:22:40		 42.415 13.223 5 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 136899
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-03-01 09:22:40 ± 0.224
Latitude 42.4150 ± 0.0123
Longitude 13.2230 ± 0.0183
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 136899

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) 2032.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 106
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
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) 0.00130
Epicentral distance of station farthest from the epicenter (degree) 0.00988
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 136899
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:07:38

M:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 136899
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:32:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.ARV.Z. 1991-03-01T09:23:18.80 10.0 undecidable manual SN 349 1.0989 0.75 0.4
--.ASS.Z. 1991-03-01T09:23:08.29 10.0 undecidable manual SG 327 0.7659 0.67 0.5
--.CIO.Z. 1991-03-01T09:23:08.42 10.0 undecidable manual SG 355 0.777 0.47 0.8
--.ARV.Z. 1991-03-01T09:23:03.80 10.0 undecidable manual PN 349 1.0989 1.83 0.1
--.AZI.Z. 1991-03-01T09:22:57.36 10.0 undecidable manual SG 159 0.444 -0.15 0.8
--.ALP.Z. 1991-03-01T09:22:56.48 10.0 undecidable manual SG 34 0.444 -0.64 0.9
--.CIO.Z. 1991-03-01T09:22:56.22 10.0 undecidable manual PG 355 0.777 0.08 1.6
--.ASS.Z. 1991-03-01T09:22:55.77 10.0 undecidable manual PG 327 0.7659 -0.18 1.6
--.MNS.Z. 1991-03-01T09:22:54.58 10.0 undecidable manual SG 265 0.3996 -0.99 0.4
--.AZI.Z. 1991-03-01T09:22:50.91 10.0 undecidable manual PG 159 0.444 0.8 1.2
--.ALP.Z. 1991-03-01T09:22:48.85 10.0 undecidable manual PG 34 0.444 -1.04 1.8
--.MNS.Z. 1991-03-01T09:22:48.28 10.0 undecidable manual PG 265 0.3996 -0.71 1.3
--.AQU.Z. 1991-03-01T09:22:46.21 10.0 undecidable manual SG 114 0.1443 0.36 0.7
--.AQU.Z. 1991-03-01T09:22:43.27 10.0 undecidable manual PG 114 0.1443 -0.11 1.9
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download