Question: What was the Richter magnitude of this earthquake in New South Wales that caused cosmetic damage on University House?

Context paragraphs:
University House, Newcastle, New South Wales: University House is a heritage-listed building in Newcastle in New South Wales, Australia.  Located on the corner of King Street and Auckland Street, it was designed by architect Emil Sodersten in association with local architectural practice Pitt and Merewether.  An example of Art Deco style, the design was inspired by the streamlined functionalism of contemporary architecture in Europe.  The building was constructed between 1937 and 1939 for the Newcastle Electricity Supply Council Administration and was originally known as N.E.S.C.A House.  The interior, designed by Guy Allbut, originally comprised a demonstration theatre, showroom, offices and staff accommodation.  In 1959, when Shortland County Council became responsible for electricity supply in the Hunter Region, they constructed a three storey extension at the back of the building.  A tower was added in 1967 and remodelling was carried out in 1969 and 1970.  After the council vacated the building in 1987, a radio station and an architectural practice moved in.  The building only sustained cosmetic damage during the 1989 Newcastle earthquake.  In 1995, the University of Newcastle established a library there.

1931 Dogger Bank earthquake: The Dogger Bank earthquake of 1931 was the strongest earthquake recorded in the United Kingdom since measurements began.  It had a magnitude of 6.1 on the Richter magnitude scale, and it caused a shaking intensity of III ("Weak") to IV ("Light") on the Mercalli intensity scale.  The location of the earthquake in the North Sea meant that damage was significantly less than it would have been had the epicentre been on the British mainland.

2007 Gisborne earthquake: The 2007 Gisborne earthquake occurred under the Pacific Ocean about 50 km off the eastern coast of New Zealand's North Island at 8:55 pm NZDT on 20 December.  The tremor had a Richter magnitude of 6.7 and maximum Mercalli intensity of VIII ("Severe"), and affected the city of Gisborne, but was felt widely across the country from Auckland in the north to Dunedin in the south.

1989 Newcastle earthquake: The 1989 Newcastle earthquake occurred in Newcastle, New South Wales on Thursday, 28 December.  The shock measured 5.6 on the Richter magnitude scale and was one of Australia's most serious natural disasters, killing 13 people and injuring more than 160.  The damage bill has been estimated at A$ 4 billion (including an insured loss of about $1 billion).

Osmussaar earthquake: The Osmussaar earthquake occurred on 25 October 1976 near the north tip of Osmussaar, an island close to the coast of Estonia.  Its hypocenter was 10-13 km below ground level, and it was measured at 4.7 on the Richter magnitude scale.  The earthquake was the most powerful recorded in Estonia; it caused rockfall along the north and northeastern coasts, and some houses took structural damage.  The earthquake was largely felt in surrounding areas like north Estonia, south Finland and Sweden.  Aftershocks also took place in November.

1948 Desert Hot Springs earthquake: The 1948 Desert Hot Springs earthquake occurred on December 4 at 3:43 p.m. Pacific Standard Time with a Richter magnitude of 6.3 and a maximum Mercalli intensity of VII ("Very strong").  The shock was felt from the central coast of California in the north, and to Baja California in the south, and came at a time when earthquake research in southern California was being resumed following the Second World War.  It was one of two events in the 20th century that have occurred near a complex region of the southern San Andreas Fault System where it traverses the San Gorgonio Pass and the northern Coachella Valley.  Damage was not severe, but some serious injuries occurred, and aftershocks continued until 1957.

1961 New South Wales earthquake: The 1961 New South Wales earthquake (also called the Robertson earthquake) occurred on May 22 in New South Wales, Australia.  Reaching a Richter magnitude of 5.5 and causing significant structural damage in a wide area.

1812 Caracas earthquake: The 1812 Caracas earthquake took place in Venezuela on March 26 (on Maundy Thursday) at 4:37 p.m.  It measured 7.7 on the Richter magnitude scale.  It caused extensive damage in Caracas, La Guaira, Barquisimeto, San Felipe, and Mérida.  An estimated 15,000-20,000 people perished as a result, in addition to incalculable material damage.

1959 Hebgen Lake earthquake: The 1959 Hebgen Lake earthquake also known as the 1959 Yellowstone earthquake occurred on August 17 at 11:37 pm (MST) in southwestern Montana, United States.  The earthquake measured 7.3 – 7.5 on the Richter magnitude scale, and caused a huge landslide that caused over 28 fatalities and left US$11 million (equivalent to $  million in 2016 ) in damage.  The slide blocked the flow of the Madison River, resulting in the creation of Quake Lake.  Significant effects of the earthquake were also felt in nearby Idaho and Wyoming, and lesser effects as far away as Puerto Rico and Hawaii.

1949 Ambato earthquake: The 1949 Ambato earthquake was the largest earthquake in the Western Hemisphere in more than five years.  On August 5, 1949, it struck Ecuador's Tungurahua Province southeast of its capital Ambato and killed 5,050 people.  Measuring 6.8 on the Richter magnitude scale, it originated from a hypocenter 40 km (25 mi) beneath the surface.  The nearby villages of Guano, Patate, Pelileo, and Pillaro were destroyed, and the city of Ambato suffered heavy damage.  The earthquake flattened buildings and subsequent landslides caused damage throughout the Tungurahua, Chimborazo, and Cotopaxi Provinces.  It disrupted water mains and communication lines and opened a fissure into which the small town of Libertad sank.  Moderate shaking from the event extended as far away as Quito and Guayaquil.

Supporting paragraphs: University House, Newcastle, New South Wales 1989 Newcastle earthquake
Answer: 5.6