Earthquake with magnitude of Md 2.0 on date 23-07-1991 and time 16:54:24 (UTC) in region 5 km N Posta (RI)

A magnitude Md 2.0 earthquake occured in region: 5 km N Posta (RI), on

  • 23-07-1991 16:54:24 (UTC)
  • 23-07-1991 18:54:24 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.57, 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
Posta RI 5 694 694
Borbona RI 6 617 1311
Cittareale RI 7 482 1793
Montereale AQ 12 2581 4374
Leonessa RI 12 2435 6809
Micigliano RI 14 127 6936
Cagnano Amiterno AQ 15 1369 8305
Monteleone di Spoleto PG 16 599 8904
Amatrice RI 16 2657 11561
Capitignano AQ 16 665 12226
Antrodoco RI 17 2588 14814
Accumoli RI 18 667 15481
Borgo Velino RI 18 972 16453
Cascia PG 19 3217 19670
Barete AQ 19 737 20407
Poggio Bustone RI 20 2055 22462

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km NW of L'Aquila (69753 inhabitants)
38 Km E of Terni (111501 inhabitants)
50 Km W of Teramo (54892 inhabitants)
55 Km SE of Foligno (57155 inhabitants)
70 Km NE of Guidonia Montecelio (88673 inhabitants)
72 Km NE of Tivoli (56533 inhabitants)
84 Km E of Viterbo (67173 inhabitants)
84 Km SE of Perugia (166134 inhabitants)
85 Km W of Montesilvano (53738 inhabitants)
90 Km W of Chieti (51815 inhabitants)
91 Km NE of Roma (2864731 inhabitants)
91 Km W of Pescara (121014 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 2.0 1991-07-23
16:54:24
42.57 13.11 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 146099
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-07-23 16:54:24 ± 0.177
Latitude 42.57 ± 0.01
Longitude 13.11 ± 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 146099

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) 1776.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 130
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00267
Epicentral distance of station farthest from the epicenter (degree) 0.00356
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

Field Value
Value 2
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 146099
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:16:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.RMF.Z. 1991-07-23T16:54:38.91 10.0 undecidable manual SG 10 0.0035 0.34 0.6
--.ALP.Z. 1991-07-23T16:54:37.91 10.0 undecidable manual SG 57 0.0036 -0.77 0.2
--.MNS.Z. 1991-07-23T16:54:37.00 10.0 undecidable manual SG 240 0.0032 -0.71 0.2
--.AQU.Z. 1991-07-23T16:54:36.00 10.0 undecidable manual SG 134 0.0027 0.36 0.6
--.MNS.Z. 1991-07-23T16:54:32.00 10.0 undecidable manual PG 240 0.0032 0.06 2.2
--.RMF.Z. 1991-07-23T16:54:32.91 10.0 undecidable manual PG 10 0.0035 0.48 1.2
--.ALP.Z. 1991-07-23T16:54:32.00 10.0 undecidable manual PG 57 0.0036 -0.49 1.1
--.AQU.Z. 1991-07-23T16:54:31.00 10.0 undecidable manual PG 134 0.0027 0.26 1.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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