ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Md 2.9 on date 04-02-1985 and time 21:13:32 (Italy) in region Costa Laziale (Roma)

A magnitude Md 2.9 earthquake occured in region: Costa Laziale (Roma), on

  • 04-02-1985 20:13:32 (UTC)
  • 04-02-1985 21:13:32 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.29, 12.56 at 2 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
Anzio RM 19 54211 54211

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km SW of Anzio (54211 inhabitants)
35 Km S of Aprilia (73446 inhabitants)
35 Km SW of Latina (125985 inhabitants)
43 Km S of Pomezia (62966 inhabitants)
48 Km SW of Velletri (53303 inhabitants)
60 Km SE of Fiumicino (78395 inhabitants)
67 Km S of Roma (2864731 inhabitants)
78 Km S of Tivoli (56533 inhabitants)
80 Km S of Guidonia Montecelio (88673 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 2.9 1985-02-04
20:13:32
41.29 12.56 2 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 1089
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-04 20:13:32 ± 1.26
Latitude 41.29 ± 0.03
Longitude 12.56 ± 0.05
Depth (km) 2 ± 6 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 1089

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) 5319.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 200
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) 0.00429
Epicentral distance of station farthest from the epicenter (degree) 0.01595
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

Md:2.9

Field Value
Value 2.9
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 1089
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:06:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1985-02-04T20:14:09.50 10.0 undecidable manual SG 4 0.0099 -1.44 0.2
--.AS1.Z. 1985-02-04T20:14:05.00 10.0 undecidable manual PN 2 0.0159 1.09 0.6
--.MA1.Z. 1985-02-04T20:14:00.00 10.0 undecidable manual PN 317 0.0138 -0.68 1.1
--.DUI.Z. 1985-02-04T20:14:00.00 10.0 undecidable manual PN 74 0.0132 0.26 1.5
--.SOR.Z. 1985-02-04T20:13:59.60 10.0 undecidable manual PN 117 0.0136 -0.79 1
--.PO9.Z. 1985-02-04T20:13:58.00 10.0 undecidable manual PN 12 0.0118 0.38 1.5
--.SGG.Z. 1985-02-04T20:13:58.80 10.0 undecidable manual PN 85 0.0123 0.43 1.4
--.AQU.Z. 1985-02-04T20:13:57.20 10.0 undecidable manual PN 30 0.0111 0.67 1.2
--.MNS.Z. 1985-02-04T20:13:54.00 10.0 undecidable manual PG 4 0.0099 -0.63 1.4
--.RMP.N. 1985-02-04T20:13:53.00 10.0 undecidable manual SG 11 0.0048 0.23 0.7
--.SD1.Z. 1985-02-04T20:13:52.50 10.0 undecidable manual PG 65 0.0092 -0.79 1.1
--.RDP.Z. 1985-02-04T20:13:51.00 10.0 undecidable manual SG 14 0.0043 0.04 1.1
--.RMP.Z. 1985-02-04T20:13:46.00 10.0 undecidable manual PG? 11 0.0048 1.87 0
--.RDP.Z. 1985-02-04T20:13:43.50 10.0 undecidable manual PG 14 0.0043 0.41 0
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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