Earthquake with magnitude of Md 2.5 on date 23-08-1985 and time 23:49:35 (UTC) in region 3 km SE Cittareale (RI)

A magnitude Md 2.5 earthquake occured in region: 3 km SE Cittareale (RI), on

  • 23-08-1985 23:49:35 (UTC)
  • 24-08-1985 01:49:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6, 13.17 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
Cittareale RI 3 482 482
Borbona RI 10 617 1099
Posta RI 10 694 1793
Montereale AQ 10 2581 4374
Amatrice RI 10 2657 7031
Accumoli RI 13 667 7698
Capitignano AQ 14 665 8363
Cagnano Amiterno AQ 16 1369 9732
Campotosto AQ 17 542 10274
Leonessa RI 17 2435 12709
Micigliano RI 19 127 12836
Cascia PG 19 3217 16053
Barete AQ 19 737 16790
Monteleone di Spoleto PG 19 599 17389

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km NW of L'Aquila (69753 inhabitants)
43 Km E of Terni (111501 inhabitants)
44 Km W of Teramo (54892 inhabitants)
55 Km SE of Foligno (57155 inhabitants)
76 Km NE of Guidonia Montecelio (88673 inhabitants)
77 Km NE of Tivoli (56533 inhabitants)
81 Km W of Montesilvano (53738 inhabitants)
85 Km SE of Perugia (166134 inhabitants)
86 Km W of Chieti (51815 inhabitants)
87 Km W of Pescara (121014 inhabitants)
90 Km E of Viterbo (67173 inhabitants)
96 Km NE of Roma (2864731 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 2.5 1985-08-23
23:49:35
42.6 13.17 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 12299
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-08-23 23:49:35 ± 0.217
Latitude 42.60 ± 0.01
Longitude 13.17 ± 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 12299

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) 1905.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00146
Epicentral distance of station farthest from the epicenter (degree) 0.00899
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 12299
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:15:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AR1.Z. 1985-08-23T23:50:07.50 10.0 undecidable manual SG 349 0.0082 0.5 0.5
--.AS1.Z. 1985-08-23T23:49:57.00 10.0 undecidable manual SG 320 0.0053 0.14 0.8
--.SD1.Z. 1985-08-23T23:49:56.20 10.0 undecidable manual PG 151 0.009 0.75 0.6
--.CM2.Z. 1985-08-23T23:49:56.90 10.0 undecidable manual SG 357 0.0053 0.2 1.1
--.AM1.Z. 1985-08-23T23:49:55.60 10.0 undecidable manual PG? 18 0.009 0.21 0.5
--.AR1.Z. 1985-08-23T23:49:52.50 10.0 undecidable manual PG 349 0.0082 -1.27 0.4
--.RDP.Z. 1985-08-23T23:49:52.00 10.0 undecidable manual PG 201 0.0081 -1.53 0.3
--.MNS.Z. 1985-08-23T23:49:51.00 10.0 undecidable manual SG 239 0.0037 -0.04 0.8
--.ALP.Z. 1985-08-23T23:49:48.70 10.0 undecidable manual SG 57 0.0031 0.05 1.2
--.AS1.Z. 1985-08-23T23:49:48.00 10.0 undecidable manual PG 320 0.0053 0.09 1.9
--.CM2.Z. 1985-08-23T23:49:47.20 10.0 undecidable manual PG 357 0.0053 -0.62 1.6
--.MNS.Z. 1985-08-23T23:49:44.20 10.0 undecidable manual PG 239 0.0037 -0.34 1.9
--.PO9.Z. 1985-08-23T23:49:44.00 10.0 undecidable manual SG 262 0.0015 0.95 0.3
--.ALP.Z. 1985-08-23T23:49:43.30 10.0 undecidable manual PG 57 0.0031 0.13 1.9
--.PO9.Z. 1985-08-23T23:49:40.50 10.0 undecidable manual PG 262 0.0015 0.56 1.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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