INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of Md 2.0 on date 18-04-1985 and time 03:25:54 (Italy) in region 6 km SE Cittareale (RI)

A magnitude Md 2.0 earthquake occured in region: 6 km SE Cittareale (RI), on

  • 18-04-1985 01:25:54 (UTC)
  • 18-04-1985 03:25:54 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.57, 13.19 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 6 482 482
Montereale AQ 7 2581 3063
Borbona RI 8 617 3680
Posta RI 9 694 4374
Amatrice RI 11 2657 7031
Capitignano AQ 11 665 7696
Cagnano Amiterno AQ 13 1369 9065
Accumoli RI 15 667 9732
Campotosto AQ 15 542 10274
Barete AQ 15 737 11011
Pizzoli AQ 17 4326 15337
Micigliano RI 17 127 15464
Leonessa RI 19 2435 17899
Antrodoco RI 19 2588 20487

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km NW of L'Aquila (69753 inhabitants)
43 Km W of Teramo (54892 inhabitants)
45 Km E of Terni (111501 inhabitants)
59 Km SE of Foligno (57155 inhabitants)
74 Km NE of Guidonia Montecelio (88673 inhabitants)
75 Km NE of Tivoli (56533 inhabitants)
79 Km W of Montesilvano (53738 inhabitants)
84 Km W of Chieti (51815 inhabitants)
85 Km W of Pescara (121014 inhabitants)
89 Km SE of Perugia (166134 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
95 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 2.0 1985-04-18
01:25:54
42.57 13.19 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 4829
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-18 01:25:54 ± 0.44
Latitude 42.57 ± 0.03
Longitude 13.19 ± 0.04
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 4829

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) 4063.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 99
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) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.00235
Epicentral distance of station farthest from the epicenter (degree) 0.00567
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 3
Type of magnitude Md
Reference to an origin 4829
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:09:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AS1.Z. 1985-04-18T01:26:17.00 10.0 undecidable manual SG 321 0.0057 -0.02 0.5
--.AS1.Z. 1985-04-18T01:26:10.00 10.0 undecidable manual PG? 321 0.0057 2.35 0
--.MNS.Z. 1985-04-18T01:26:09.50 10.0 undecidable manual SG 244 0.0037 -0.73 0.5
--.ALP.Z. 1985-04-18T01:26:07.50 10.0 undecidable manual SG 52 0.0031 -0.4 0.9
--.AQU.Z. 1985-04-18T01:26:06.50 10.0 undecidable manual SG 144 0.0023 1.19 0.3
--.MNS.Z. 1985-04-18T01:26:02.50 10.0 undecidable manual PG 244 0.0037 -1.23 0.7
--.AQU.Z. 1985-04-18T01:26:01.00 10.0 negative manual PG 144 0.0023 0.11 3.2
--.ALP.Z. 1985-04-18T01:26:01.50 10.0 undecidable manual PG 52 0.0031 -0.89 2
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