Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.1 on date 28-05-1989 and time 02:57:48 (UTC) in region 3 km NW Colonna (RM)

A magnitude Md 2.1 earthquake occured in region: 3 km NW Colonna (RM), on

  • 28-05-1989 02:57:48 (UTC)
  • 28-05-1989 04:57:48 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.8550, 12.7300 at 8 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
Colonna RM 3 4287 4287
Monte Porzio Catone RM 4 8693 12980
Monte Compatri RM 5 11978 24958
Frascati RM 7 22087 47045
San Cesareo RM 7 15153 62198
Rocca Priora RM 7 11962 74160
Gallicano nel Lazio RM 8 6334 80494
Zagarolo RM 9 17843 98337
Grottaferrata RM 9 20327 118664
Rocca di Papa RM 10 17034 135698
Marino RM 11 43026 178724
Ciampino RM 12 38412 217136
Palestrina RM 13 21672 238808
Tivoli RM 14 56533 295341
Castel Gandolfo RM 14 8997 304338
Castel San Pietro Romano RM 14 902 305240
San Gregorio da Sassola RM 14 1619 306859
Poli RM 14 2418 309277
Casape RM 14 744 310021
Nemi RM 15 1943 311964
Labico RM 15 6379 318343
Albano Laziale RM 15 41715 360058
Ariccia RM 16 19407 379465
Guidonia Montecelio RM 16 88673 468138
Lariano RM 16 13432 481570
Genzano di Roma RM 17 23970 505540
Cave RM 17 11287 516827
Castel Madama RM 18 7399 524226
Valmontone RM 18 15959 540185
Rocca di Cave RM 18 377 540562
Fonte Nuova RM 18 32562 573124
Capranica Prenestina RM 19 351 573475
Velletri RM 19 53303 626778
Lanuvio RM 20 13632 640410
San Polo dei Cavalieri RM 20 2992 643402
Marcellina RM 20 7280 650682
Sant'Angelo Romano RM 20 5018 655700

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km SW of Tivoli (56533 inhabitants)
16 Km S of Guidonia Montecelio (88673 inhabitants)
19 Km N of Velletri (53303 inhabitants)
21 Km E of Roma (2864731 inhabitants)
28 Km NE of Pomezia (62966 inhabitants)
30 Km N of Aprilia (73446 inhabitants)
42 Km E of Fiumicino (78395 inhabitants)
45 Km NW of Latina (125985 inhabitants)
46 Km N of Anzio (54211 inhabitants)
78 Km SW of L'Aquila (69753 inhabitants)
79 Km S of Terni (111501 inhabitants)
81 Km SE of Viterbo (67173 inhabitants)
82 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 1.5 		1989-05-28
02:57:48		 41.855 12.73 8 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 92199
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1989-05-28 02:57:48 ± 0.18
Latitude 41.8550 ± 0.0093
Longitude 12.7300 ± 0.0093
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 92199

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) 1289.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 242
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) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00040
Epicentral distance of station farthest from the epicenter (degree) 0.00729
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 4
Type of magnitude Md
Reference to an origin 92199
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:26:29

ML:1.5

Field Value
Value 1.5
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 92199
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. 1989-05-28T02:58:17.10 10.0 undecidable manual SG 99 0.8103 -0.33 0
--.SDI.Z. 1989-05-28T02:58:05.57 10.0 undecidable manual PG 99 0.8103 0.21 0.3
--.CP9.Z. 1989-05-28T02:57:55.98 10.0 undecidable manual SG 87 0.1665 0.14 0.4
--.RDP.Z. 1989-05-28T02:57:53.57 10.0 undecidable manual SG 185 0.0888 0.01 0.7
--.CP9.Z. 1989-05-28T02:57:52.81 10.0 undecidable manual PG 87 0.1665 -0.09 1.4
--.RMP.Z. 1989-05-28T02:57:52.29 10.0 undecidable manual SG 205 0.0444 0.05 0.6
--.RDP.Z. 1989-05-28T02:57:51.59 10.0 undecidable manual PG 185 0.0888 0.01 1.7
--.RMP.Z. 1989-05-28T02:57:50.75 10.0 positive manual PG 205 0.0444 -0.07 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