Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 20-11-1989 and time 15:36:26 (UTC) in region 3 km NW Lariano (RM)

A magnitude Md 2.5 earthquake occured in region: 3 km NW Lariano (RM), on

  • 20-11-1989 15:36:26 (UTC)
  • 20-11-1989 16:36:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.7490, 12.8110 at 5 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Lariano RM 3 13432 13432
Rocca Priora RM 6 11962 25394
Velletri RM 7 53303 78697
Labico RM 8 6379 85076
San Cesareo RM 8 15153 100229
Nemi RM 9 1943 102172
Rocca di Papa RM 9 17034 119206
Artena RM 9 14276 133482
Monte Compatri RM 9 11978 145460
Valmontone RM 10 15959 161419
Zagarolo RM 10 17843 179262
Monte Porzio Catone RM 11 8693 187955
Colonna RM 11 4287 192242
Genzano di Roma RM 11 23970 216212
Lanuvio RM 12 13632 229844
Ariccia RM 12 19407 249251
Rocca Massima LT 12 1136 250387
Palestrina RM 12 21672 272059
Frascati RM 13 22087 294146
Grottaferrata RM 13 20327 314473
Cave RM 13 11287 325760
Albano Laziale RM 13 41715 367475
Marino RM 13 43026 410501
Castel San Pietro Romano RM 13 902 411403
Castel Gandolfo RM 13 8997 420400
Gallicano nel Lazio RM 14 6334 426734
Cori LT 15 11065 437799
Rocca di Cave RM 16 377 438176
Colleferro RM 16 21595 459771
Genazzano RM 16 6036 465807
Poli RM 17 2418 468225
Capranica Prenestina RM 17 351 468576
Cisterna di Latina LT 17 36868 505444
Ciampino RM 18 38412 543856
Casape RM 19 744 544600
Segni RM 19 9159 553759
San Gregorio da Sassola RM 20 1619 555378

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km NE of Velletri (53303 inhabitants)
22 Km NE of Aprilia (73446 inhabitants)
24 Km S of Tivoli (56533 inhabitants)
27 Km E of Pomezia (62966 inhabitants)
29 Km S of Guidonia Montecelio (88673 inhabitants)
32 Km SE of Roma (2864731 inhabitants)
32 Km N of Latina (125985 inhabitants)
37 Km NE of Anzio (54211 inhabitants)
48 Km E of Fiumicino (78395 inhabitants)
83 Km SW of L'Aquila (69753 inhabitants)
91 Km S of Terni (111501 inhabitants)
92 Km E of Civitavecchia (52991 inhabitants)
95 Km SE of Viterbo (67173 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 2.5
ML-VAX 1.7 		1989-11-20
15:36:26		 41.749 12.811 5 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 104739
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1989-11-20 15:36:26 ± 0.29
Latitude 41.7490 ± 0.0205
Longitude 12.8110 ± 0.0231
Depth (km) 5 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 104739

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) 2981.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 185
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00057
Epicentral distance of station farthest from the epicenter (degree) 0.00664
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 104739
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:37:34

ML:1.7

Field Value
Value 1.7
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 104739
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.MNS.Z. 1989-11-20T15:36:50.67 10.0 undecidable manual SG 351 0.6327 0.44 0.2
--.SDI.Z. 1989-11-20T15:36:42.54 10.0 undecidable manual PG 92 0.7326 0.32 0.7
--.MNS.Z. 1989-11-20T15:36:39.92 10.0 undecidable manual PG 351 0.6327 -0.37 0.7
--.CP9.Z. 1989-11-20T15:36:33.66 10.0 undecidable manual SG 42 0.1554 0.76 0.1
--.RDP.Z. 1989-11-20T15:36:30.48 10.0 undecidable manual SG 277 0.0666 0.54 0.2
--.RMP.Z. 1989-11-20T15:36:30.79 10.0 undecidable manual SG 307 0.0999 -0.21 0.6
--.RMP.Z. 1989-11-20T15:36:29.36 10.0 positive manual PG 307 0.0999 0.17 3.1
--.CP9.Z. 1989-11-20T15:36:29.63 10.0 undecidable manual PG 42 0.1554 -0.66 0.4
--.RDP.Z. 1989-11-20T15:36:28.39 10.0 positive manual PG 277 0.0666 -0.18 3
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download