Earthquake with magnitude of Md 2.2 on date 27-03-1991 and time 03:40:29 (Italy) in region 2 km SW Borbona (RI)

A magnitude Md 2.2 earthquake occured in region: 2 km SW Borbona (RI), on

  • 27-03-1991 02:40:29 (UTC)
  • 27-03-1991 03:40:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.5, 13.11 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
Borbona RI 2 617 617
Posta RI 3 694 1311
Micigliano RI 7 127 1438
Antrodoco RI 10 2588 4026
Cagnano Amiterno AQ 11 1369 5395
Borgo Velino RI 11 972 6367
Montereale AQ 12 2581 8948
Castel Sant'Angelo RI 13 1308 10256
Leonessa RI 14 2435 12691
Cittareale RI 14 482 13173
Barete AQ 15 737 13910
Capitignano AQ 16 665 14575
Pizzoli AQ 17 4326 18901
Cantalice RI 17 2755 21656
Poggio Bustone RI 18 2055 23711
Cittaducale RI 18 6828 30539
Scoppito AQ 19 3727 34266

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km NW of L'Aquila (69753 inhabitants)
39 Km E of Terni (111501 inhabitants)
52 Km W of Teramo (54892 inhabitants)
61 Km SE of Foligno (57155 inhabitants)
64 Km NE of Guidonia Montecelio (88673 inhabitants)
65 Km NE of Tivoli (56533 inhabitants)
83 Km E of Viterbo (67173 inhabitants)
85 Km NE of Roma (2864731 inhabitants)
85 Km W of Montesilvano (53738 inhabitants)
88 Km W of Chieti (51815 inhabitants)
90 Km SE of Perugia (166134 inhabitants)
91 Km W of Pescara (121014 inhabitants)
95 Km N of Velletri (53303 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 1991-03-27
02:40:29
42.5 13.11 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 138329
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-03-27 02:40:29 ± 0.13
Latitude 42.50 ± 0.01
Longitude 13.11 ± 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 138329

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) 1380.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
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) 0.00235
Epicentral distance of station farthest from the epicenter (degree) 0.00899
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 138329
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:09:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ASS.Z. 1991-03-27T02:40:52.19 10.0 undecidable manual SG 329 0.0058 -0.21 0.3
--.ARV.Z. 1991-03-27T02:40:50.00 10.0 undecidable manual PG 353 0.009 0.77 0.3
--.ASS.Z. 1991-03-27T02:40:42.50 10.0 undecidable manual PG 329 0.0058 -0.23 0.9
--.MNS.Z. 1991-03-27T02:40:42.25 10.0 undecidable manual SG 250 0.003 0.01 0.8
--.AQU.Z. 1991-03-27T02:40:39.69 10.0 undecidable manual SG 124 0.0023 -0.11 0.7
--.MNS.Z. 1991-03-27T02:40:36.88 10.0 undecidable manual PG 250 0.003 0.02 2
--.AQU.Z. 1991-03-27T02:40:35.47 10.0 undecidable manual PG 124 0.0023 0.02 2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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