Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.1 on date 28-05-1989 and time 16:07:31 (Italy) in region 2 km W Zagarolo (RM)

A magnitude Md 2.1 earthquake occured in region: 2 km W Zagarolo (RM), on

  • 28-05-1989 14:07:31 (UTC)
  • 28-05-1989 16:07:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.8500, 12.8060 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
Zagarolo RM 2 17843 17843
Gallicano nel Lazio RM 3 6334 24177
San Cesareo RM 3 15153 39330
Colonna RM 5 4287 43617
Rocca Priora RM 7 11962 55579
Palestrina RM 7 21672 77251
Monte Compatri RM 7 11978 89229
Castel San Pietro Romano RM 7 902 90131
Monte Porzio Catone RM 8 8693 98824
Poli RM 8 2418 101242
Casape RM 9 744 101986
San Gregorio da Sassola RM 10 1619 103605
Labico RM 10 6379 109984
Cave RM 11 11287 121271
Frascati RM 11 22087 143358
Rocca di Cave RM 12 377 143735
Capranica Prenestina RM 12 351 144086
Valmontone RM 12 15959 160045
Rocca di Papa RM 13 17034 177079
Tivoli RM 13 56533 233612
Grottaferrata RM 13 20327 253939
Lariano RM 14 13432 267371
Genazzano RM 14 6036 273407
Pisoniano RM 14 770 274177
Marino RM 15 43026 317203
Castel Madama RM 15 7399 324602
San Vito Romano RM 15 3273 327875
Artena RM 15 14276 342151
Nemi RM 16 1943 344094
Ciciliano RM 17 1336 345430
Castel Gandolfo RM 17 8997 354427
Ciampino RM 18 38412 392839
Albano Laziale RM 18 41715 434554
Guidonia Montecelio RM 18 88673 523227
Cerreto Laziale RM 18 1118 524345
Velletri RM 18 53303 577648
Ariccia RM 18 19407 597055
Gerano RM 18 1263 598318
Genzano di Roma RM 18 23970 622288
San Polo dei Cavalieri RM 18 2992 625280
Bellegra RM 19 2887 628167
Sambuci RM 19 925 629092
Olevano Romano RM 19 6687 635779
Marcellina RM 19 7280 643059
Rocca Santo Stefano RM 19 975 644034
Vicovaro RM 20 4019 648053

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km S of Tivoli (56533 inhabitants)
18 Km SE of Guidonia Montecelio (88673 inhabitants)
18 Km N of Velletri (53303 inhabitants)
27 Km E of Roma (2864731 inhabitants)
31 Km NE of Aprilia (73446 inhabitants)
32 Km NE of Pomezia (62966 inhabitants)
43 Km N of Latina (125985 inhabitants)
47 Km NE of Anzio (54211 inhabitants)
48 Km E of Fiumicino (78395 inhabitants)
74 Km SW of L'Aquila (69753 inhabitants)
80 Km S of Terni (111501 inhabitants)
86 Km SE of Viterbo (67173 inhabitants)
88 Km E of Civitavecchia (52991 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 2.1
ML-VAX 1.6 		1989-05-28
14:07:31		 41.85 12.806 5 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 92249
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1989-05-28 14:07:31 ± 0.096
Latitude 41.8500 ± 0.0057
Longitude 12.8060 ± 0.0082
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 92249

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) 931.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 115
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00073
Epicentral distance of station farthest from the epicenter (degree) 0.00680
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitudes information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 92249
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:26:31

ML:1.6

Field Value
Value 1.6
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 92249
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
--.SDI.Z. 1989-05-28T14:07:58.56 10.0 undecidable manual SG 100 0.7548 0.19 0.3
--.MNS.Z. 1989-05-28T14:07:51.36 10.0 undecidable manual SG 350 0.5439 0.01 0.6
--.SDI.Z. 1989-05-28T14:07:46.79 10.0 undecidable manual PG 100 0.7548 -0.04 1.1
--.MNS.Z. 1989-05-28T14:07:42.79 10.0 negative manual PG 350 0.5439 0.02 2.8
--.RDP.Z. 1989-05-28T14:07:36.13 10.0 undecidable manual SG 216 0.111 0.4 0.2
--.RMP.Z. 1989-05-28T14:07:35.11 10.0 undecidable manual SG 243 0.0777 0.31 0.4
--.RDP.Z. 1989-05-28T14:07:33.37 10.0 undecidable manual PG 216 0.111 -0.38 0.4
--.RMP.Z. 1989-05-28T14:07:32.99 10.0 positive manual PG 243 0.0777 -0.23 2.1
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